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NetBSD/sys/arch/arm32/arm32/machdep.c

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/* $NetBSD: machdep.c,v 1.11 1996/10/13 03:05:54 christos Exp $ */
/*
* Copyright (c) 1994-1996 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Brini.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* RiscBSD kernel project
*
* machdep.c
*
* Machine dependant functions for kernel setup
*
* This file needs a lot of work.
*
* Created : 17/09/94
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <sys/callout.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/msgbuf.h>
#include <sys/buf.h>
#include <sys/map.h>
#include <sys/exec.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/device.h>
#include <sys/sysctl.h>
#include <sys/syscallargs.h>
#ifdef SYSVMSG
#include <sys/msg.h>
#endif
#ifdef SYSVSEM
#include <sys/sem.h>
#endif
#ifdef SYSVSHM
#include <sys/shm.h>
#endif
#include <dev/cons.h>
#include <machine/db_machdep.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#include <vm/vm_kern.h>
#include <machine/signal.h>
#include <machine/frame.h>
#include <machine/bootconfig.h>
#include <machine/katelib.h>
#include <machine/cpu.h>
#include <machine/pte.h>
#include <machine/vidc.h>
#include <machine/iomd.h>
#include <machine/io.h>
#include <machine/irqhandler.h>
#include <machine/undefined.h>
#include <machine/rtc.h>
#include "hydrabus.h"
/* Describe different actions to take when boot() is called */
#define ACTION_HALT 0x01 /* Halt and boot */
#define ACTION_REBOOT 0x02 /* Halt and request RiscBSD reboot */
#define ACTION_KSHELL 0x04 /* Call kshell */
#define ACTION_DUMP 0x08 /* Dump the system to the dump dev */
#define HALT_ACTION ACTION_HALT | ACTION_KSHELL /* boot(RB_HALT,NULL)*/
#define REBOOT_ACTION ACTION_REBOOT /* boot(0, NULL) */
#define PANIC_ACTION ACTION_HALT | ACTION_KSHELL /* panic() */
BootConfig bootconfig; /* Boot config storage */
videomemory_t videomemory; /* Video memory descriptor */
vm_offset_t physical_start;
vm_offset_t physical_freestart;
vm_offset_t physical_freeend;
vm_offset_t physical_end;
int physical_memoryblock;
u_int free_pages;
vm_offset_t pagetables_start;
int physmem = 0;
int debug_flags;
int max_processes;
int cpu_cache;
int cpu_ctrl;
u_int ramdisc_size; /* Ramdisc size */
u_int kmodule_base;
u_int kmodule_size;
u_int videodram_size; /* Amount of DRAM to reserve for video */
vm_offset_t videodram_start;
vm_offset_t physical_pt_start;
vm_offset_t virtual_pt_end;
u_int *cursor_data; /* Will move to the vidc code */
typedef struct {
vm_offset_t physical;
vm_offset_t virtual;
} pv_addr_t;
pv_addr_t systempage;
pv_addr_t irqstack;
pv_addr_t undstack;
pv_addr_t abtstack;
pv_addr_t kernelstack;
#if NHYDRABUS > 0
pv_addr_t hydrascratch;
#endif
pt_entry_t kernel_pt_table[15];
/* the following is used externally (sysctl_hw) */
char machine[] = "arm32"; /* cpu "architecture" */
char *boot_args;
extern pt_entry_t msgbufpte;
int msgbufmapped;
vm_offset_t msgbufphys;
extern u_int data_abort_handler_address;
extern u_int prefetch_abort_handler_address;
extern u_int undefined_handler_address;
extern int pmap_debug_level;
#define KERNEL_PT_PAGEDIR 0
#define KERNEL_PT_PDE 1
#define KERNEL_PT_PTE 2
#define KERNEL_PT_VMEM 3
#define KERNEL_PT_SYS 4
#define KERNEL_PT_KERNEL 5
#define KERNEL_PT_VMDATA0 6
#define KERNEL_PT_VMDATA1 7
#define KERNEL_PT_VMDATA2 8
#define KERNEL_PT_VMDATA3 9
#define KERNEL_PT_VMDATA4 10
#define KERNEL_PT_VMDATA5 11
#define KERNEL_PT_VMDATA6 12
#define KERNEL_PT_VMDATA7 13
#define KERNEL_PT_VMDATA7 13
#define KERNEL_PT_KSTACK 14
struct user *proc0paddr;
/*
* Declare these as initialized data so we can patch them.
*/
int nswbuf = 0;
#ifdef NBUF
int nbuf = NBUF;
#else
int nbuf = 0;
#endif
#ifdef BUFPAGES
int bufpages = BUFPAGES;
#else
int bufpages = 0;
#endif
int cold = 1;
/* Prototypes */
void physconputchar __P((char));
void physcon_display_base __P((u_int));
void consinit __P((void));
void map_section __P((vm_offset_t, vm_offset_t, vm_offset_t));
void map_pagetable __P((vm_offset_t, vm_offset_t, vm_offset_t));
void map_entry __P((vm_offset_t, vm_offset_t va, vm_offset_t));
void map_entry_ro __P((vm_offset_t, vm_offset_t, vm_offset_t));
void pmap_bootstrap __P((vm_offset_t /*kernel_l1pt*/));
void process_kernel_args __P((void));
u_long strtoul __P((const char */*s*/, char **/*ptr*/, int /*base*/));
caddr_t allocsys __P((caddr_t /*v*/));
void identify_cpu __P((void));
void data_abort_handler __P((trapframe_t */*frame*/));
void prefetch_abort_handler __P((trapframe_t */*frame*/));
void undefinedinstruction_bounce __P((trapframe_t */*frame*/));
extern void set_boot_devs __P((void));
extern void configure __P((void));
void zero_page_readonly __P((void));
void zero_page_readwrite __P((void));
extern u_int disassemble __P((u_int addr));
int setup_cursor __P((void));
extern void init_fpe_state __P((struct proc *));
extern int savectx __P((struct pcb *pcb));
extern void dump_spl_masks __P((void));
extern pt_entry_t *pmap_pte __P((pmap_t pmap, vm_offset_t va));
extern void db_machine_init __P((void));
extern void pmap_debug __P((int level));
extern void dumpsys __P((void));
extern void hydrastop __P((void));
void vtbugreport __P((void));
/*
* Debug function just to park the CPU
*
* This should be updated to power down an ARM7500
*/
void
halt()
{
while (1);
}
/*
* void boot(int howto, char *bootstr)
*
* Reboots the system
*
* This gets called when a reboot is request by the user or after a panic.
* Call boot0() will reboot the machine. For the moment we will try and be
* clever and return to the booting environment. This may work if we
* have be booted with the Kate boot loader as long as we have not messed
* the system up to much. Until we have our own memory management running
* this should work. The only use of being able to return (to RISC OS)
* is so I don't have to wait while the machine reboots.
*/
/* NOTE: These variables will be removed, well some of them */
extern u_int spl_mask;
extern u_int current_mask;
struct pcb dumppcb;
extern u_int arm700bugcount;
extern int ioctlconsolebug;
void
boot(howto, bootstr)
int howto;
char *bootstr;
{
int loop;
int action;
/* Debugging here */
if (curproc == NULL)
printf("curproc = 0 - must have been in cpu_idle()\n");
/* if (panicstr)
printf("ioctlconsolebug=%d %08x\n", ioctlconsolebug, ioctlconsolebug);*/
/* if (curpcb)
printf("curpcb=%08x pcb_sp=%08x pcb_und_sp=%08x\n", curpcb, curpcb->pcb_sp, curpcb->pcb_und_sp);*/
#if NHYDRABUS > 0
/*
* If we are halting the master then we should halt the slaves :-)
* otherwise it can get a bit disconcerting to have 4 other
* processor still tearing away doing things.
*/
hydrastop();
#endif
/* Debug info */
printf("boot: howto=%08x %08x curproc=%08x\n", howto, spl_mask, (u_int)curproc);
printf("current_mask=%08x spl_mask=%08x\n", current_mask, spl_mask);
printf("ipl_bio=%08x ipl_net=%08x ipl_tty=%08x ipl_clock=%08x ipl_imp=%08x\n",
irqmasks[IPL_BIO], irqmasks[IPL_NET], irqmasks[IPL_TTY],
irqmasks[IPL_CLOCK], irqmasks[IPL_IMP]);
dump_spl_masks();
/* vtbugreport();*/
/* Did we encounter the ARM700 bug we discovered ? */
if (arm700bugcount > 0)
printf("ARM700 PREFETCH/SWI bug count = %d\n", arm700bugcount);
/* Disable console buffering */
cnpollc(1);
/* If we are still cold then hit the air brakes */
if (cold) {
printf("Halted while still in the ICE age.\n");
printf("Hit a key to reboot\n");
cngetc();
boot0();
}
/*
* Depending on how we got here and with what intructions, choose
* the actions to take. (See the actions defined above)
*/
if (panicstr)
action = PANIC_ACTION;
else if (howto & RB_HALT)
action = HALT_ACTION;
else
action = REBOOT_ACTION;
/*
* If RB_NOSYNC was not specified sync the discs.
* Note: Unless cold is set to 1 here, syslogd will die during the unmount.
* It looks like syslogd is getting woken up only to find that it cannot
* page part of the binary in as the filesystem has been unmounted.
*/
if (!(howto & RB_NOSYNC)) {
cold = 1; /* no sleeping etc. */
bootsync();
}
/* Say NO to interrupts */
splhigh();
#ifdef KSHELL
/* Now enter our crude debug shell if required. Soon to be replaced with DDB */
if (action & ACTION_KSHELL)
shell();
#else
if (action & ACTION_KSHELL) {
printf("Halted.\n");
printf("Hit a key to reboot ");
cngetc();
}
#endif
/* Auto reboot overload protection */
/*
* This code stops the kernel entering an endless loop of reboot - panic
* cycles. This will only effect kernels that have been configured to
* reboot on a panic and will have the effect of stopping further reboots
* after it has rebooted 16 times after panics and clean halt or reboot
* will reset the counter.
*/
/*
* Have we done 16 reboots in a row ? If so halt rather than reboot
* since 16 panics in a row without 1 clean halt means something is
* seriously wrong
*/
if (cmos_read(RTC_ADDR_REBOOTCNT) > 16)
action = (action & ~ACTION_REBOOT) | ACTION_HALT;
/*
* If we are rebooting on a panic then up the reboot count otherwise reset
* This will thus be reset if the kernel changes the boot action from
* reboot to halt due to too any reboots.
*/
if ((action & ACTION_REBOOT) && panicstr)
cmos_write(RTC_ADDR_REBOOTCNT,
cmos_read(RTC_ADDR_REBOOTCNT) + 1);
else
cmos_write(RTC_ADDR_REBOOTCNT, 0);
/*
* If we need a RiscBSD reboot, request it but setting a bit in the CMOS RAM
* This can be detected by the RiscBSD boot loader during a RISC OS boot
* No other way to do this as RISC OS is in ROM.
*/
if (action & ACTION_REBOOT)
cmos_write(RTC_ADDR_BOOTOPTS,
cmos_read(RTC_ADDR_BOOTOPTS) | 0x02);
/* If we need to do a dump, do it */
if ((howto & RB_DUMP) && (action & ACTION_DUMP)) {
savectx(&dumppcb);
dumpsys();
}
/* Run any shutdown hooks */
printf("Running shutdown hooks ...\n");
doshutdownhooks();
/* Make sure IRQ's are disabled */
IRQdisable;
/* Tell the user we are booting */
printf("boot...");
/* Give the user time to read the last couple of lines of text. */
for (loop = 5; loop > 0; --loop) {
printf("%d..", loop);
delay(500000);
}
boot0();
}
/* Sync the discs and unmount the filesystems */
void
bootsync(void)
{
/* int iter;
int nbusy;
struct buf *bp;*/
static int bootsyncdone = 0;
if (bootsyncdone) return;
bootsyncdone = 1;
/* Make sure we can still manage to do things */
if (GetCPSR() & I32_bit) {
/*
* If we get then boot has been called with out RB_NOSYNC and interrupts were
* disabled. This means the boot() call did not come from a user process e.g.
* shutdown, but must have come from somewhere in the kernel.
*/
IRQenable;
printf("Warning IRQ's disabled during boot()\n");
}
vfs_shutdown();
}
/*
* Estimated loop for n microseconds
*/
/* Need to re-write this to use the timers */
/* One day soon I will actually do this */
void
delay(n)
u_int n;
{
u_int i;
while (--n > 0)
for (i = 8; --i;);
}
/*
* u_int initarm(BootConfig *bootconf)
*
* Initial entry point on startup. This gets called before main() is
* entered.
* It should be responcible for setting up everything that must be
* in place when main is called.
* This includes
* Taking a copy of the boot configuration structure.
* Initialising the physical console so characters can be printed.
* Setting up page tables for the kernel
* Relocating the kernel to the bottom of physical memory
*/
/* This routine is frightening mess ! This is what my mind looks like -mark */
u_int
initarm(bootconf)
BootConfig *bootconf;
{
int loop;
int loop1;
u_int logical;
u_int physical;
u_int kerneldatasize;
u_int l1pagetable;
u_int l2pagetable;
extern char page0[], page0_end[];
struct exec *kernexec = (struct exec *)KERNEL_BASE;
/* Copy the boot configuration structure */
bootconfig = *bootconf;
/*
* Initialise the video memory descriptor
*
* This will change in the future to correctly report DRAM as well
* but for the moment hardwire it. This will allow the console code
* to use the structure now.
*
* Note: all references to the video memory virtual/physical address
* should go via this structure.
*/
/*
* In the future ...
*
* All console output will be postponed until the primary bootstrap
* has been completed so that we have had a chance to reserve some
* memory for the video system if we do not have separate VRAM.
*/
videomemory.vidm_vbase = bootconfig.display_start;
videomemory.vidm_pbase = VRAM_BASE;
videomemory.vidm_type = VIDEOMEM_TYPE_VRAM;
videomemory.vidm_size = bootconfig.display_size;
/*
* Initialise the physical console
* This is done in main() but for the moment we do it here so that
* we can use printf in initarm() before main() has been called.
*/
consinit();
/* Talk to the user */
printf("initarm...\n");
printf("Kernel loaded from file %s\n", bootconfig.kernelname);
printf("Kernel arg string %s\n", (char *)bootconfig.argvirtualbase);
printf("\nBoot configuration structure reports the following memory\n");
printf(" DRAM block 0a at %08x size %08x DRAM block 0b at %08x size %08x\n\r",
bootconfig.dram[0].address,
bootconfig.dram[0].pages * bootconfig.pagesize,
bootconfig.dram[1].address,
bootconfig.dram[1].pages * bootconfig.pagesize);
printf(" DRAM block 1a at %08x size %08x DRAM block 1b at %08x size %08x\n\r",
bootconfig.dram[2].address,
bootconfig.dram[2].pages * bootconfig.pagesize,
bootconfig.dram[3].address,
bootconfig.dram[3].pages * bootconfig.pagesize);
printf(" VRAM block 0 at %08x size %08x\n\r",
bootconfig.vram[0].address,
bootconfig.vram[0].pages * bootconfig.pagesize);
printf(" videomem = %08x %08x\n", bootconfig.display_start, videomemory.vidm_vbase);
/* Check to make sure the page size is correct */
if (NBPG != bootconfig.pagesize)
panic("Page size is not %d bytes\n", NBPG);
/*
* Ok now we have the hard bit.
* We have the kernel allocated up high. The rest of the memory map is
* available. We are still running on RISC OS page tables.
*
* We need to construct new page tables move the kernel in physical
* memory and switch to them.
*
* The booter will have left us 6 pages at the top of memory.
* Two of these are used as L2 page tables and the other 4 form the L1
* page table.
*/
/*
* Ok we must construct own own page table tables.
* Once we have these we can reorganise the memory as required
*/
/*
* We better check to make sure the booter has set up the scratch
* area for us correctly. We use this area to create temporary pagetables
* while we reorganise the memory map.
*/
if ((bootconfig.scratchphysicalbase & 0x3fff) != 0)
panic("initarm: Scratch area not aligned on 16KB boundry\n");
if ((bootconfig.scratchsize < 0xc000) != 0)
panic("initarm: Scratch area too small (need >= 48KB)\n");
/*
* Ok start the primary bootstrap.
* The primary bootstrap basically replaces the booter page tables with
* new ones that it creates in the boot scratch area. These page tables
* map the rest of the physical memory into the virtaul memory map.
* This allows low physical memory to be accessed to create the
* kernels page tables, relocate the kernel code from high physical
* memory to low physical memory etc.
*/
printf("initarm: Primary bootstrap ... ");
/*
* Update the videomemory structure to reflect the mapping changes
*/
videomemory.vidm_vbase = VMEM_VBASE;
videomemory.vidm_pbase = VRAM_BASE;
videomemory.vidm_type = VIDEOMEM_TYPE_VRAM;
videomemory.vidm_size = bootconfig.vram[0].pages * NBPG;
kerneldatasize = bootconfig.kernsize + bootconfig.argsize;
l2pagetable = bootconfig.scratchvirtualbase;
l1pagetable = l2pagetable + 0x4000;
/*
* Now we construct a L2 pagetables for the VRAM, the current kernel memory
* and the new kernel memory
*/
for (logical = 0; logical < 0x200000; logical += NBPG) {
map_entry(l2pagetable + 0x1000, logical,
bootconfig.vram[0].address + logical);
map_entry(l2pagetable + 0x1000, logical + 0x200000,
bootconfig.vram[0].address + logical);
}
for (logical = 0; logical < kerneldatasize + bootconfig.scratchsize;
logical += NBPG) {
map_entry(l2pagetable + 0x3000, logical,
bootconfig.kernphysicalbase + logical);
}
#if NHYDRABUS > 0
for (logical = 0; logical < 0x200000; logical += NBPG) {
map_entry(l2pagetable + 0x2000, logical,
bootconfig.dram[0].address + logical + NBPG);
}
#else
for (logical = 0; logical < 0x200000; logical += NBPG) {
map_entry(l2pagetable + 0x2000, logical,
bootconfig.dram[0].address + logical);
}
#endif
/*
* Now we construct the L1 pagetable. This only needs the minimum to
* keep us going until we can contruct the proper kernel L1 page table.
*/
map_section(l1pagetable, VIDC_BASE, VIDC_HW_BASE);
map_section(l1pagetable, IOMD_BASE, IOMD_HW_BASE);
map_pagetable(l1pagetable, 0x00000000,
bootconfig.scratchphysicalbase + 0x2000);
map_pagetable(l1pagetable, KERNEL_BASE,
bootconfig.scratchphysicalbase + 0x3000);
map_pagetable(l1pagetable, VMEM_VBASE,
bootconfig.scratchphysicalbase + 0x1000);
/* Print some debugging info */
/*
printf("page tables look like this ...\n");
printf("V0x00000000 - %08x\n", ReadWord(l1pagetable + 0x0000));
printf("V0x03500000 - %08x\n", ReadWord(l1pagetable + 0x00d4));
printf("V0x00200000 - %08x\n", ReadWord(l1pagetable + 0x0080));
printf("V0xf4000000 - %08x\n", ReadWord(l1pagetable + 0x3d00));
printf("V0xf0000000 - %08x\n", ReadWord(l1pagetable + 0x3c00));
printf("page dir = P%08x\n", bootconfig.scratchphysicalbase + 0x4000);
printf("l1= V%08x\n", l1pagetable);
*/
/*
* Pheww right we are ready to switch page tables !!!
* The L1 table is at bootconfig.scratchphysicalbase + 0x4000
*/
/* Switch tables */
setttb(bootconfig.scratchphysicalbase + 0x4000);
/* Since we have mapped the VRAM up into kernel space we must now update the
* the bootconfig and display structures by hand.
*/
bootconfig.display_start = VMEM_VBASE;
physcon_display_base(VMEM_VBASE);
printf("done.\n");
/*
* Ok we have finished the primary boot strap. All this has done is to
* allow us to access all the physical memory from known virtual
* location. We also now know that all the used pages are at the top
* of the physical memory and where they are in the virtual memory map.
*
* This should be the stage we are at at the end of the bootstrap when
* we have a two stage booter.
*
* The secondary bootstrap has the responcibility to sort locating the
* kernel to the correct address and for creating the kernel page tables.
* It must also set up various memory pointers that are used by pmap etc.
*/
process_kernel_args();
printf("initarm: Secondary bootstrap ... ");
/* Zero down the memory we mapped in for the secondary bootstrap */
bzero(0x00000000, 0x200000);
/* Set up the variables that define the availablilty of physcial memory */
physical_start = bootconfig.dram[0].address;
physical_freestart = physical_start;
physical_end = bootconfig.dram[bootconfig.dramblocks - 1].address
+ bootconfig.dram[bootconfig.dramblocks - 1].pages * NBPG;
physical_freeend = physical_end;
physical_memoryblock = 0;
free_pages = bootconfig.drampages;
for (loop = 0; loop < bootconfig.dramblocks; ++loop)
physmem += bootconfig.dram[loop].pages;
/*
* Reserve some pages at the top of the memory for later use
*
* This area is not currently used but could be used for the allocation
* of L1 page tables for each process.
* The size of this memory would be determined by the maximum number of
* processes.
*
* For the moment we just reserve a few pages just to make sure the
* system copes.
*/
physical_freeend -= videodram_size;
free_pages -= (videodram_size / NBPG);
videodram_start = physical_freeend;
physical_freeend -= PD_SIZE * max_processes;
free_pages -= 4 * max_processes;
pagetables_start = physical_freeend;
/* Right We have the bottom meg of memory mapped to 0x00000000
* so was can get at it. The kernel will ocupy the start of it.
* After the kernel/args we allocate some the the fixed page tables
* we need to get the system going.
* We allocate one page directory and 8 page tables and store the
* physical addresses in the kernel_pt_table array.
* Must remember that neither the page L1 or L2 page tables are the same
* size as a page !
*
* Ok the next bit of physical allocate may look complex but it is
* simple really. I have done it like this so that no memory gets wasted
* during the allocate of various pages and tables that are all different
* sizes.
* The start address will be page aligned.
* We allocate the kernel page directory on the first free 16KB boundry
* we find.
* We allocate the kernel page tables on the first 1KB boundry we find.
* We allocate 9 PT's. This means that in the process we
* KNOW that we will encounter at least 1 16KB boundry.
*
* Eventually if the top end of the memory gets used for process L1 page
* tables the kernel L1 page table may be moved up there.
*/
/*
* The Simtec Hydra board needs a 2MB aligned page for bootstrapping.
* Simplest thing is to nick the bottom page of physical memory.
*/
#if NHYDRABUS > 0
hydrascratch.physical = physical_start;
physical_start += NBPG;
--free_pages;
#endif
physical = physical_start + kerneldatasize;
/* printf("physical=%08x next_phys=%08x\n", physical, pmap_next_phys_page(physical - NBPG));*/
loop1 = 1;
kernel_pt_table[0] = 0;
for (loop = 0; loop < 15; ++loop) {
if ((physical & (PD_SIZE-1)) == 0 && kernel_pt_table[0] == 0) {
kernel_pt_table[KERNEL_PT_PAGEDIR] = physical;
bzero((char *)physical - physical_start, PD_SIZE);
physical += PD_SIZE;
} else {
kernel_pt_table[loop1] = physical;
bzero((char *)physical - physical_start, PT_SIZE);
physical += PT_SIZE;
++loop1;
}
}
/* A bit of debugging info */
/*
for (loop=0; loop < 10; ++loop)
printf("%d - P%08x\n", loop, kernel_pt_table[loop]);
*/
/* This should never be able to happen but better confirm that. */
if ((kernel_pt_table[0] & (PD_SIZE-1)) != 0)
panic("initarm: Failed to align the kernel page directory\n");
/* Update the address of the first free page of physical memory */
physical_freestart = physical;
/* printf("physical_fs=%08x next_phys=%08x\n", (u_int)physical_freestart, (u_int)pmap_next_phys_page(physical_freestart - NBPG));*/
free_pages -= (physical - physical_start) / NBPG;
/* Allocate a page for the system page mapped to 0x00000000 */
systempage.physical = physical_freestart;
physical_freestart += NBPG;
/* printf("(0)physical_fs=%08x next_phys=%08x\n", (u_int)physical_freestart, (u_int)pmap_next_phys_page(physical_freestart - NBPG));*/
--free_pages;
bzero((char *)systempage.physical - physical_start, NBPG);
/* Allocate another 3 pages for the stacks in different CPU modes. */
irqstack.physical = physical_freestart;
physical_freestart += NBPG;
abtstack.physical = physical_freestart;
physical_freestart += NBPG;
undstack.physical = physical_freestart;
physical_freestart += NBPG;
bzero((char *)irqstack.physical - physical_start, 3*NBPG);
free_pages -= 3;
irqstack.virtual = KERNEL_BASE + irqstack.physical-physical_start;
abtstack.virtual = KERNEL_BASE + abtstack.physical-physical_start;
undstack.virtual = KERNEL_BASE + undstack.physical-physical_start;
/* printf("(1)physical_fs=%08x next_phys=%08x\n", (u_int)physical_freestart, (u_int)pmap_next_phys_page(physical_freestart - NBPG));*/
kernelstack.physical = physical_freestart;
physical_freestart += UPAGES * NBPG;
bzero((char *)kernelstack.physical - physical_start, UPAGES * NBPG);
free_pages -= UPAGES;
/* printf("(2)physical_fs=%08x next_phys=%08x\n", (u_int)physical_freestart, (u_int)pmap_next_phys_page(physical_freestart - NBPG));*/
kernelstack.virtual = KERNEL_BASE + kernelstack.physical
- physical_start;
msgbufphys = physical_freestart;
physical_freestart += round_page(sizeof(struct msgbuf));
free_pages -= round_page(sizeof(struct msgbuf)) / NBPG;
/* printf("physical_fs=%08x next_phys=%08x\n", (u_int)physical_freestart, (u_int)pmap_next_phys_page(physical_freestart - NBPG));*/
/* Ok we have allocated physical pages for the primary kernel page tables */
/* Now we fill in the L2 pagetable for the kernel code/data */
l2pagetable = kernel_pt_table[KERNEL_PT_KERNEL] - physical_start;
if (N_GETMAGIC(kernexec[0]) == ZMAGIC) {
/* printf("[ktext read-only] ");
printf("[%08x %08x %08x] \n", (u_int)kerneldatasize, (u_int)kernexec->a_text,
(u_int)(kernexec->a_text+kernexec->a_data+kernexec->a_bss));*/
/* printf("physical start=%08x physical freestart=%08x hydra phys=%08x\n", physical_start, physical_freestart, hydrascratch.physical);*/
for (logical = 0; logical < 0x00/*kernexec->a_text*/;
logical += NBPG)
map_entry_ro(l2pagetable, logical, physical_start
+ logical);
for (; logical < kerneldatasize; logical += NBPG)
map_entry(l2pagetable, logical, physical_start
+ logical);
} else
for (logical = 0; logical < kerneldatasize; logical += NBPG)
map_entry(l2pagetable, logical, physical_start
+ logical);
/* Map the stack pages */
map_entry(l2pagetable, irqstack.physical-physical_start,
irqstack.physical);
map_entry(l2pagetable, abtstack.physical-physical_start,
abtstack.physical);
map_entry(l2pagetable, undstack.physical-physical_start,
undstack.physical);
map_entry(l2pagetable, kernelstack.physical - physical_start,
kernelstack.physical);
map_entry(l2pagetable, kernelstack.physical + NBPG - physical_start,
kernelstack.physical + NBPG);
l2pagetable = kernel_pt_table[KERNEL_PT_KSTACK] - physical_start;
map_entry(l2pagetable, 0x003fe000, kernelstack.physical);
map_entry(l2pagetable, 0x003ff000, kernelstack.physical + NBPG);
/* Now we fill in the L2 pagetable for the VRAM */
/*
* Current architectures mean that the VRAM is always in 1 continuous
* bank.
* This means that we can just map the 2 meg that the VRAM would occupy.
* In theory we don't need a page table for VRAM, we could section map
* it but we would need the page tables if DRAM was in use.
*/
l2pagetable = kernel_pt_table[KERNEL_PT_VMEM] - physical_start;
for (logical = 0; logical < 0x200000; logical += NBPG) {
map_entry(l2pagetable, logical, bootconfig.vram[0].address
+ logical);
map_entry(l2pagetable, logical + 0x200000,
bootconfig.vram[0].address + logical);
}
/* Map entries in the page table used to map PDE's */
l2pagetable = kernel_pt_table[KERNEL_PT_PDE] - physical_start;
map_entry(l2pagetable, 0x0000000,
kernel_pt_table[KERNEL_PT_PAGEDIR]);
map_entry(l2pagetable, 0x0001000,
kernel_pt_table[KERNEL_PT_PAGEDIR] + 0x1000);
map_entry(l2pagetable, 0x0002000,
kernel_pt_table[KERNEL_PT_PAGEDIR] + 0x2000);
map_entry(l2pagetable, 0x0003000,
kernel_pt_table[KERNEL_PT_PAGEDIR] + 0x3000);
/*
* Map entries in the page table used to map PTE's
* Basically every kernel page table gets mapped here
*/
l2pagetable = kernel_pt_table[KERNEL_PT_PTE] - physical_start;
map_entry(l2pagetable, (KERNEL_BASE >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_KERNEL]);
map_entry(l2pagetable, (PAGE_DIRS_BASE >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_PDE]);
map_entry(l2pagetable, (PROCESS_PAGE_TBLS_BASE >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_PTE]);
map_entry(l2pagetable, (VMEM_VBASE >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMEM]);
map_entry(l2pagetable, (0x00000000 >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_SYS]);
map_entry(l2pagetable, ((KERNEL_VM_BASE + 0x00000000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMDATA0]);
map_entry(l2pagetable, ((KERNEL_VM_BASE + 0x00400000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMDATA1]);
map_entry(l2pagetable, ((KERNEL_VM_BASE + 0x00800000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMDATA2]);
map_entry(l2pagetable, ((KERNEL_VM_BASE + 0x00c00000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMDATA3]);
map_entry(l2pagetable, ((KERNEL_VM_BASE + 0x01000000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMDATA4]);
map_entry(l2pagetable, ((KERNEL_VM_BASE + 0x01400000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMDATA5]);
map_entry(l2pagetable, ((KERNEL_VM_BASE + 0x01800000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMDATA6]);
map_entry(l2pagetable, ((KERNEL_VM_BASE + 0x01c00000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_VMDATA7]);
map_entry(l2pagetable, ((0xef800000) >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_KSTACK]);
map_entry(l2pagetable, (0xf5000000 >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_PAGEDIR] + 0x0000);
map_entry(l2pagetable, (0xf5400000 >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_PAGEDIR] + 0x1000);
map_entry(l2pagetable, (0xf5800000 >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_PAGEDIR] + 0x2000);
map_entry(l2pagetable, (0xf5c00000 >> (PGSHIFT-2)),
kernel_pt_table[KERNEL_PT_PAGEDIR] + 0x3000);
/*
* Map the system page in the kernel page table for the bottom 1Meg
* of the virtual memory map.
*/
l2pagetable = kernel_pt_table[KERNEL_PT_SYS] - physical_start;
map_entry(l2pagetable, 0x0000000, systempage.physical);
/* Now we construct the L1 pagetable */
l1pagetable = kernel_pt_table[KERNEL_PT_PAGEDIR] - physical_start;
/* Map the VIDC20, IOMD, COMBO and podules */
/* Map the VIDC20 */
map_section(l1pagetable, VIDC_BASE, VIDC_HW_BASE);
/* Map the IOMD (and SLOW and MEDIUM simple podules) */
map_section(l1pagetable, IOMD_BASE, IOMD_HW_BASE);
/* Map the COMBO (and module space) */
map_section(l1pagetable, IO_BASE, IO_HW_BASE);
/* Map the L2 pages tables in the L1 page table */
map_pagetable(l1pagetable, 0x00000000,
kernel_pt_table[KERNEL_PT_SYS]);
map_pagetable(l1pagetable, 0xef800000,
kernel_pt_table[KERNEL_PT_KSTACK]);
map_pagetable(l1pagetable, KERNEL_BASE,
kernel_pt_table[KERNEL_PT_KERNEL]);
map_pagetable(l1pagetable, KERNEL_VM_BASE + 0x00000000,
kernel_pt_table[KERNEL_PT_VMDATA0]);
map_pagetable(l1pagetable, KERNEL_VM_BASE + 0x00400000,
kernel_pt_table[KERNEL_PT_VMDATA1]);
map_pagetable(l1pagetable, KERNEL_VM_BASE + 0x00800000,
kernel_pt_table[KERNEL_PT_VMDATA2]);
map_pagetable(l1pagetable, KERNEL_VM_BASE + 0x00c00000,
kernel_pt_table[KERNEL_PT_VMDATA3]);
map_pagetable(l1pagetable, KERNEL_VM_BASE + 0x01000000,
kernel_pt_table[KERNEL_PT_VMDATA4]);
map_pagetable(l1pagetable, KERNEL_VM_BASE + 0x01400000,
kernel_pt_table[KERNEL_PT_VMDATA5]);
map_pagetable(l1pagetable, KERNEL_VM_BASE + 0x01800000,
kernel_pt_table[KERNEL_PT_VMDATA6]);
map_pagetable(l1pagetable, KERNEL_VM_BASE + 0x01c00000,
kernel_pt_table[KERNEL_PT_VMDATA7]);
map_pagetable(l1pagetable, PAGE_DIRS_BASE,
kernel_pt_table[KERNEL_PT_PDE]);
map_pagetable(l1pagetable, PROCESS_PAGE_TBLS_BASE,
kernel_pt_table[KERNEL_PT_PTE]);
map_pagetable(l1pagetable, VMEM_VBASE,
kernel_pt_table[KERNEL_PT_VMEM]);
/* Bit more debugging info */
/*
printf("page tables look like this ...\n");
printf("V0x00000000 - %08x\n", ReadWord(l1pagetable + 0x0000));
printf("V0x03200000 - %08x\n", ReadWord(l1pagetable + 0x00c8));
printf("V0x03500000 - %08x\n", ReadWord(l1pagetable + 0x00d4));
printf("V0xf0000000 - %08x\n", ReadWord(l1pagetable + 0x3c00));
printf("V0xf1000000 - %08x\n", ReadWord(l1pagetable + 0x3c40));
printf("V0xf2000000 - %08x\n", ReadWord(l1pagetable + 0x3c80));
printf("V0xf3000000 - %08x\n", ReadWord(l1pagetable + 0x3cc0));
printf("V0xf3300000 - %08x\n", ReadWord(l1pagetable + 0x3ccc));
printf("V0xf4000000 - %08x\n", ReadWord(l1pagetable + 0x3d00));
printf("V0xf6000000 - %08x\n", ReadWord(l1pagetable + 0x3d80));
*/
/* printf("V0xefc00000 - %08x\n", ReadWord(l1pagetable + 0x3bf8));
printf("V0xef800000 - %08x\n", ReadWord(l1pagetable + 0x3bfc));*/
/*
* Now we have the real page tables in place so we can switch to them.
* Once this is done we will be running with the REAL kernel page tables.
*/
/*
* The last thing we must do is copy the kernel down to the new memory.
* This copies all our kernel data structures and variables as well
* which is why it is left to the last moment.
*/
printf("mapping ... ");
bcopy((char *)KERNEL_BASE, (char *)0x00000000, kerneldatasize);
/* Switch tables */
setttb(kernel_pt_table[KERNEL_PT_PAGEDIR]);
printf("done.\n");
/* Right set up the vectors at the bottom of page 0 */
bcopy(page0, (char *)0x00000000, page0_end - page0);
/*
* Pages were allocated during the secondary bootstrap for the
* stacks for different CPU modes.
* We must now set the r13 registers in the different CPU modes to
* point to these stacks.
* Since the ARM stacks use STMFD etc. we must set r13 to the top end
* of the stack memory.
*/
#ifdef DIAGNOSTIC
printf("IRQ stack V%08x P%08x\n", (u_int) irqstack.virtual,
(u_int) irqstack.physical);
printf("ABT stack V%08x P%08x\n", (u_int) abtstack.virtual,
(u_int) abtstack.physical);
printf("UND stack V%08x P%08x\n", (u_int) undstack.virtual,
(u_int) undstack.physical);
#endif
printf("init subsystems: stacks ");
set_stackptr(PSR_IRQ32_MODE, irqstack.virtual + NBPG);
set_stackptr(PSR_ABT32_MODE, abtstack.virtual + NBPG);
set_stackptr(PSR_UND32_MODE, undstack.virtual + NBPG);
if (pmap_debug_level >= 0)
printf("kstack V%08x P%08x\n", (int) kernelstack.virtual,
(int) kernelstack.physical);
/*
* Well we should set a data abort handler.
* Once things get going this will change as we will need a proper handler.
* Until then we will use a handler that just panics but tells us
* why.
* Initialisation of the vectors will just panic on a data abort.
* This just fills in a slighly better one.
*/
printf("vectors ");
data_abort_handler_address = (u_int)data_abort_handler;
prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
undefined_handler_address = (u_int)undefinedinstruction_bounce;
#ifdef SA110
idcflush();
tlbflush();
#endif
/* Diagnostic stuff. while writing the boot code */
/*
for (loop = 0x0; loop < 0x1000; ++loop) {
if (ReadWord(PAGE_DIRS_BASE + loop * 4) != 0)
printf("Pagetable for V%08x = %08x\n", loop << 20,
ReadWord(0xf2000000 + loop * 4));
}
*/
/* Diagnostic stuff. while writing the boot code */
/*
for (loop = 0x0; loop < 0x400; ++loop) {
if (ReadWord(kernel_pt_table[KERNEL_PT_PTE] + loop * 4) != 0)
printf("Pagetable for V%08x P%08x = %08x\n",
loop << 22, kernel_pt_table[KERNEL_PT_PTE]+loop*4,
ReadWord(kernel_pt_table[KERNEL_PT_PTE]+loop * 4));
}
*/
/* At last !
* We now have the kernel in physical memory from the bottom upwards.
* Kernel page tables are physically above this.
* The kernel is mapped to 0xf0000000
* The kernel data PTs will handle the mapping of 0xf1000000-0xf1ffffff
* 2Meg of VRAM is mapped to 0xf4000000
* The kernel page directory is mapped to 0xf3000000
* The page tables are mapped to 0xefc00000
* The IOMD is mapped to 0xf6000000
* The VIDC is mapped to 0xf6100000
*/
/* Initialise the undefined instruction handlers */
printf("undefined ");
undefined_init();
/* Boot strap pmap telling it where the kernel page table is */
printf("pmap ");
pmap_bootstrap(PAGE_DIRS_BASE);
/* Setup the IRQ system */
printf("irq ");
irq_init();
printf("done.\n");
#ifdef DDB
printf("ddb: ");
db_machine_init();
ddb_init();
if (boothowto & RB_KDB)
Debugger();
#endif
/* We return the new stack pointer address */
return(kernelstack.virtual + USPACE_SVC_STACK_TOP);
}
/*
* void cpu_startup(void)
*
* Machine dependant startup code.
*
*/
void
cpu_startup()
{
int loop;
vm_offset_t minaddr;
vm_offset_t maxaddr;
caddr_t sysbase;
caddr_t size;
vm_size_t bufsize;
int base, residual;
/* Set the cpu control register */
cpu_ctrl = CPU_CONTROL_MMU_ENABLE | CPU_CONTROL_32BP_ENABLE
| CPU_CONTROL_32BD_ENABLE | CPU_CONTROL_SYST_ENABLE;
if (cpu_cache & 1)
cpu_ctrl |= CPU_CONTROL_IDC_ENABLE;
if (cpu_cache & 2)
cpu_ctrl |= CPU_CONTROL_WBUF_ENABLE;
if (!(cpu_cache & 4))
cpu_ctrl |= CPU_CONTROL_CPCLK;
#ifdef CPU_LATE_ABORT
cpu_ctrl |= CPU_CONTROL_LABT_ENABLE;
#endif
#ifdef CPU_SA110
cpu_ctrl = CPU_CONTROL_MMU_ENABLE | CPU_CONTROL_32BP_ENABLE
| CPU_CONTROL_32BD_ENABLE | CPU_CONTROL_SYST_ENABLE;
#endif
/* Clear out the cache */
idcflush();
cpu_control(cpu_ctrl);
/* All domains MUST be clients, permissions are VERY important */
cpu_domains(DOMAIN_CLIENT);
/* Lock down zero page */
zero_page_readonly();
/*
* Initialize error message buffer (at end of core).
*/
/* msgbufphys was setup during the secondary boot strap */
for (loop = 0; loop < btoc(sizeof(struct msgbuf)); ++loop)
pmap_enter(pmap_kernel(),
(vm_offset_t)((caddr_t)msgbufp + loop * NBPG),
msgbufphys + loop * NBPG, VM_PROT_ALL, TRUE);
msgbufmapped = 1;
/*
* Identify ourselves for the msgbuf (everything printed earlier will
* not be buffered).
*/
printf(version);
printf("screen: %d x %d x %d\n", bootconfig.width + 1, bootconfig.height + 1, bootconfig.framerate);
if (cmos_read(RTC_ADDR_REBOOTCNT) > 0)
printf("Warning: REBOOTCNT = %d\n", cmos_read(RTC_ADDR_REBOOTCNT));
printf("real mem = %d (%d pages)\n", arm_page_to_byte(physmem), physmem);
/*
* Find out how much space we need, allocate it,
* and then give everything true virtual addresses.
*/
size = allocsys((caddr_t)0);
sysbase = (caddr_t)kmem_alloc(kernel_map, round_page(size));
if (sysbase == 0)
panic("cpu_startup: no room for system tables %d bytes required", (u_int)size);
if ((caddr_t)((allocsys(sysbase) - sysbase)) != size)
panic("cpu_startup: system table size inconsistency");
/*
* Now allocate buffers proper. They are different than the above
* in that they usually occupy more virtual memory than physical.
*/
bufsize = MAXBSIZE * nbuf;
buffer_map = kmem_suballoc(kernel_map, (vm_offset_t *)&buffers,
&maxaddr, bufsize, TRUE);
minaddr = (vm_offset_t)buffers;
if (vm_map_find(buffer_map, vm_object_allocate(bufsize),
(vm_offset_t)0, &minaddr, bufsize, FALSE) != KERN_SUCCESS)
panic("startup: cannot allocate buffers");
if ((bufpages / nbuf) >= btoc(MAXBSIZE)) {
/* don't want to alloc more physical mem than needed */
bufpages = btoc(MAXBSIZE) * nbuf;
}
base = bufpages / nbuf;
residual = bufpages % nbuf;
for (loop = 0; loop < nbuf; ++loop) {
vm_size_t curbufsize;
vm_offset_t curbuf;
/*
* First <residual> buffers get (base+1) physical pages
* allocated for them. The rest get (base) physical pages.
*
* The rest of each buffer occupies virtual space,
* but has no physical memory allocated for it.
*/
curbuf = (vm_offset_t)buffers + loop * MAXBSIZE;
curbufsize = CLBYTES * (loop < residual ? base+1 : base);
vm_map_pageable(buffer_map, curbuf, curbuf+curbufsize, FALSE);
vm_map_simplify(buffer_map, curbuf);
}
/*
* Allocate a submap for exec arguments. This map effectively
* limits the number of processes exec'ing at any time.
*/
exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
16*NCARGS, TRUE);
/*
* Allocate a submap for physio
*/
phys_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
VM_PHYS_SIZE, TRUE);
/*
* Finally, allocate mbuf pool. Since mclrefcnt is an off-size
* we use the more space efficient malloc in place of kmem_alloc.
*/
mclrefcnt = (char *)malloc(NMBCLUSTERS+CLBYTES/MCLBYTES,
M_MBUF, M_NOWAIT);
bzero(mclrefcnt, NMBCLUSTERS+CLBYTES/MCLBYTES);
mb_map = kmem_suballoc(kernel_map, (vm_offset_t *)&mbutl, &maxaddr,
VM_MBUF_SIZE, FALSE);
/*
printf("mb_buf: map=%08x maxaddr = %08x mbutl = %08x\n", mb_map, maxaddr, mbutl);
*/
/*
* Initialise callouts
*/
callfree = callout;
for (loop = 1; loop < ncallout; ++loop)
callout[loop - 1].c_next = &callout[loop];
printf("avail mem = %d (%d pages)\n", (int)ptoa(cnt.v_free_count),
(int)ptoa(cnt.v_free_count) / NBPG);
printf("using %d buffers containing %d bytes of memory\n",
nbuf, bufpages * CLBYTES);
/*
* Set up buffers, so they can be used to read disk labels.
*/
bufinit();
proc0paddr = (struct user *)kernelstack.virtual;
proc0.p_addr = proc0paddr;
curpcb = &proc0.p_addr->u_pcb;
curpcb->pcb_flags = 0;
curpcb->pcb_und_sp = (u_int)proc0.p_addr + USPACE_UNDEF_STACK_TOP;
curpcb->pcb_sp = (u_int)proc0.p_addr + USPACE_SVC_STACK_TOP;
curpcb->pcb_pagedir = (pd_entry_t *)pmap_extract(kernel_pmap,
(vm_offset_t)(kernel_pmap)->pm_pdir);
proc0.p_md.md_regs = (struct trapframe *)curpcb->pcb_sp - 1;
#if 0
/* Hack proc0 */
proc0paddr = (struct user *)kernelstack.virtual;
proc0.p_addr = proc0paddr;
curpcb = &proc0.p_addr->u_pcb;
proc0.p_addr->u_pcb.pcb_flags = 0;
proc0.p_addr->u_pcb.pcb_und_sp = (u_int)proc0.p_addr + USPACE_UNDEF_STACK_TOP;
proc0.p_addr->u_pcb.pcb_pagedir = (pd_entry_t *)pmap_extract(kernel_pmap,
(vm_offset_t)(kernel_pmap)->pm_pdir);
#endif
/*
* Install an IRQ handler on the VSYNC interrupt to reboot if the
* middle mouse button is pressed.
*/
setup_cursor();
/* Allocate memory for the kmodule area if required */
if (kmodule_size) {
kmodule_size = round_page(kmodule_size);
kmodule_base = (u_int)kmem_alloc(kernel_map, kmodule_size);
if (kmodule_base)
printf("KMODULE SPACE = %08x\n", kmodule_base);
else
printf("\x1b[31mNO KMODULE SPACE\n\x1b[0m");
}
/*
* Configure the hardware
*/
configure();
/* Set the root, swap and dump devices from the boot args */
set_boot_devs();
dump_spl_masks();
cold = 0; /* We are warm now ... */
}
/*
* Allocate space for system data structures. We are given
* a starting virtual address and we return a final virtual
* address; along the way we set each data structure pointer.
*
* We call allocsys() with 0 to find out how much space we want,
* allocate that much and fill it with zeroes, and then call
* allocsys() again with the correct base virtual address.
*/
caddr_t
allocsys(v)
register caddr_t v;
{
#define valloc(name, type, num) \
(caddr_t)(name) = (type *)v; \
v = (caddr_t)((name) + (num));
valloc(callout, struct callout, ncallout);
valloc(swapmap, struct map, nswapmap = maxproc * 2);
#ifdef SYSVSHM
valloc(shmsegs, struct shmid_ds, shminfo.shmmni);
#endif
#ifdef SYSVSEM
valloc(sema, struct semid_ds, seminfo.semmni);
valloc(sem, struct sem, seminfo.semmns);
/* This is pretty disgusting! */
valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int));
#endif
#ifdef SYSVMSG
valloc(msgpool, char, msginfo.msgmax);
valloc(msgmaps, struct msgmap, msginfo.msgseg);
valloc(msghdrs, struct msg, msginfo.msgtql);
valloc(msqids, struct msqid_ds, msginfo.msgmni);
#endif
/*
* Determine how many buffers to allocate. We use 10% of the
* first 2MB of memory, and 5% of the rest, with a minimum of 16
* buffers. We allocate 1/2 as many swap buffer headers as file
* i/o buffers.
*/
if (bufpages == 0)
if (physmem < arm_byte_to_page(2 * 1024 * 1024))
bufpages = physmem / (10 * CLSIZE);
else
bufpages = (arm_byte_to_page(2 * 1024 * 1024)
+ physmem) / (20 * CLSIZE);
#ifdef DIAGNOSTIC
if (bufpages == 0)
panic("bufpages = 0\n");
#endif
if (nbuf == 0) {
nbuf = bufpages;
if (nbuf < 16)
nbuf = 16;
}
if (nswbuf == 0) {
nswbuf = (nbuf / 2) & ~1; /* force even */
if (nswbuf > 256)
nswbuf = 256; /* sanity */
}
valloc(swbuf, struct buf, nswbuf);
valloc(buf, struct buf, nbuf);
return(v);
}
/* A few functions that are used to help construct the page tables
* during the bootstrap process.
*/
void
map_section(pagetable, va, pa)
vm_offset_t pagetable;
vm_offset_t va;
vm_offset_t pa;
{
if ((va & 0xfffff) != 0)
panic("initarm: Cannot allocate 1MB section on non 1MB boundry\n");
((u_int *)pagetable)[(va >> 20)] = L1_SEC((pa & PD_MASK));
}
void
map_pagetable(pagetable, va, pa)
vm_offset_t pagetable;
vm_offset_t va;
vm_offset_t pa;
{
if ((pa & 0xc00) != 0)
panic("pagetables should be group allocated on pageboundry");
((u_int *)pagetable)[(va >> 20) + 0] = L1_PTE((pa & PG_FRAME) + 0x000);
((u_int *)pagetable)[(va >> 20) + 1] = L1_PTE((pa & PG_FRAME) + 0x400);
((u_int *)pagetable)[(va >> 20) + 2] = L1_PTE((pa & PG_FRAME) + 0x800);
((u_int *)pagetable)[(va >> 20) + 3] = L1_PTE((pa & PG_FRAME) + 0xc00);
}
void
map_entry(pagetable, va, pa)
vm_offset_t pagetable;
vm_offset_t va;
vm_offset_t pa;
{
WriteWord(pagetable + ((va >> 10) & 0x00000ffc),
L2_PTE((pa & PG_FRAME), AP_KRW));
}
void
map_entry_nc(pagetable, va, pa)
vm_offset_t pagetable;
vm_offset_t va;
vm_offset_t pa;
{
WriteWord(pagetable + ((va >> 10) & 0x00000ffc),
L2_PTE_NC((pa & PG_FRAME), AP_KRW));
}
void
map_entry_ro(pagetable, va, pa)
vm_offset_t pagetable;
vm_offset_t va;
vm_offset_t pa;
{
WriteWord(pagetable + ((va >> 10) & 0x00000ffc),
L2_PTE((pa & PG_FRAME), AP_KR));
}
int wdresethack = 1;
void
process_kernel_args()
{
char *ptr;
char *args;
/* Ok now we will check the arguments for interesting parameters. */
args = (char *)bootconfig.argvirtualbase;
max_processes = 64;
boothowto = 0;
kmodule_size = 0;
cpu_cache = 0x03;
debug_flags = 0;
videodram_size = 0;
/* Skip the first parameter (the boot loader filename) */
while (*args != ' ' && *args != 0)
++args;
while (*args == ' ')
++args;
/* Skip the kernel image filename */
while (*args != ' ' && *args != 0)
++args;
while (*args == ' ')
++args;
boot_args = NULL;
if (*args != 0) {
boot_args = args;
if (strstr(args, "nocache"))
cpu_cache &= ~1;
if (strstr(args, "nowritebuf"))
cpu_cache &= ~2;
if (strstr(args, "fpaclk2"))
cpu_cache |= 4;
ptr = strstr(args, "maxproc=");
if (ptr) {
max_processes = (int)strtoul(ptr + 8, NULL, 10);
if (max_processes < 16)
max_processes = 16;
if (max_processes > 256)
max_processes = 256;
printf("Maximum \"in memory\" processes = %d\n",
max_processes);
}
ptr = strstr(args, "ramdisc=");
if (ptr) {
ramdisc_size = (u_int)strtoul(ptr + 8, NULL, 10);
ramdisc_size *= 1024;
if (ramdisc_size < 32*1024)
ramdisc_size = 32*1024;
if (ramdisc_size > 2048*1024)
ramdisc_size = 2048*1024;
}
ptr = strstr(args, "kmodule=");
if (ptr) {
kmodule_size = (u_int)strtoul(ptr + 8, NULL, 10);
kmodule_size *= 1024;
if (kmodule_size < 4*1024)
kmodule_size = 4*1024;
if (kmodule_size > 256*1024)
kmodule_size = 256*1024;
}
ptr = strstr(args, "videodram=");
if (ptr) {
videodram_size = (u_int)strtoul(ptr + 10, NULL, 10);
/* Round to 4K page */
videodram_size *= 1024;
videodram_size = round_page(videodram_size);
if (videodram_size > 1024*1024)
videodram_size = 1024*1024;
printf("VIDEO DRAM = %d\n", videodram_size);
}
if (strstr(args, "single"))
boothowto |= RB_SINGLE;
if (strstr(args, "kdb"))
boothowto |= RB_KDB;
ptr = strstr(args, "pmapdebug=");
if (ptr) {
pmap_debug_level = (int)strtoul(ptr + 10, NULL, 10);
pmap_debug(pmap_debug_level);
debug_flags |= 0x01;
}
if (strstr(args, "termdebug"))
debug_flags |= 0x02;
if (strstr(args, "nowdreset"))
wdresethack = 0;
if (strstr(args, "notermcls"))
debug_flags |= 0x04;
}
}
/* This should happen in the console code - This really must move soon */
int
setup_cursor()
{
/* The cursor currently gets set up here. slightly wasteful on memory */
/*
* This should be done in the vidc code as that is responcible for the cursor.
* This will probably happen when the vidc code is separated from the console
* (currently work in progress)
*/
cursor_data = (u_int *)kmem_alloc(kernel_map, NBPG);
/* printf("Cursor data page = V%08x P%08x\n", cursor_data, pmap_extract(kernel_pmap, (vm_offset_t)cursor_data));*/
WriteWord(IOMD_CURSINIT, pmap_extract(kernel_pmap,
(vm_offset_t)cursor_data));
return(0);
}
/*
* Clear registers on exec
*/
void
setregs(p, pack, stack, retval)
struct proc *p;
struct exec_package *pack;
u_long stack;
register_t *retval;
{
register struct trapframe *tf;
if (pmap_debug_level >= -1)
printf("setregs: ip=%08x sp=%08x proc=%08x\n",
(u_int) pack->ep_entry, (u_int) stack, (u_int) p);
tf = p->p_md.md_regs;
if (pmap_debug_level >= -1)
printf("mdregs=%08x pc=%08x lr=%08x sp=%08x\n",
(u_int) tf, tf->tf_pc, tf->tf_usr_lr, tf->tf_usr_sp);
tf->tf_r11 = 0; /* bottom of the fp chain */
tf->tf_r12 = 0; /* ??? */
tf->tf_pc = pack->ep_entry;
tf->tf_usr_lr = pack->ep_entry;
tf->tf_svc_lr = 0x77777777; /* Something we can see */
tf->tf_usr_sp = stack;
tf->tf_r10 = 0xaa55aa55; /* Something we can see */
tf->tf_spsr = PSR_USR32_MODE;
p->p_addr->u_pcb.pcb_flags = 0;
retval[1] = 0;
}
/*
* Modify the current mapping for zero page to make it read only
*
* This routine is only used until things start forking. Then new
* system pages are mapped read only in pmap_enter().
*/
void
zero_page_readonly()
{
WriteWord(0xefc00000, L2_PTE((systempage.physical & PG_FRAME), AP_KR));
tlbflush();
}
/*
* Modify the current mapping for zero page to make it read/write
*
* This routine is only used until things start forking. Then system
* pages belonging to user processes are never made writable.
*/
void
zero_page_readwrite()
{
WriteWord(0xefc00000, L2_PTE((systempage.physical & PG_FRAME), AP_KRW));
tlbflush();
}
/*
* Send an interrupt to process.
*
* Stack is set up to allow sigcode stored in u. to call routine, followed by kcall
* to sigreturn routine below. After sigreturn resets the signal mask, the stack, and the
* frame pointer, it returns to the user specified pc.
*/
void
sendsig(catcher, sig, mask, code)
sig_t catcher;
int sig;
int mask;
u_long code;
{
struct proc *p = curproc;
struct trapframe *tf;
struct sigframe *fp, frame;
struct sigacts *psp = p->p_sigacts;
int oonstack;
extern char sigcode[], esigcode[];
if (pmap_debug_level >= 0)
printf("Sendsig: sig=%d mask=%08x catcher=%08x code=%08x\n",
sig, mask, (u_int)catcher, (u_int)code);
tf = p->p_md.md_regs;
oonstack = psp->ps_sigstk.ss_flags & SA_ONSTACK;
/*
* Allocate space for the signal handler context.
*/
if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack &&
(psp->ps_sigonstack & sigmask(sig))) {
fp = (struct sigframe *)(psp->ps_sigstk.ss_sp +
psp->ps_sigstk.ss_size - sizeof(struct sigframe));
psp->ps_sigstk.ss_flags |= SA_ONSTACK;
} else {
fp = (struct sigframe *)tf->tf_usr_sp - 1;
}
/*
* Build the argument list for the signal handler.
*/
frame.sf_signum = sig;
frame.sf_code = code;
frame.sf_scp = &fp->sf_sc;
frame.sf_handler = catcher;
/*
* Build the signal context to be used by sigreturn.
*/
frame.sf_sc.sc_onstack = oonstack;
frame.sf_sc.sc_mask = mask;
frame.sf_sc.sc_r0 = tf->tf_r0;
frame.sf_sc.sc_r1 = tf->tf_r1;
frame.sf_sc.sc_r2 = tf->tf_r2;
frame.sf_sc.sc_r3 = tf->tf_r3;
frame.sf_sc.sc_r4 = tf->tf_r4;
frame.sf_sc.sc_r5 = tf->tf_r5;
frame.sf_sc.sc_r6 = tf->tf_r6;
frame.sf_sc.sc_r7 = tf->tf_r7;
frame.sf_sc.sc_r8 = tf->tf_r8;
frame.sf_sc.sc_r9 = tf->tf_r9;
frame.sf_sc.sc_r10 = tf->tf_r10;
frame.sf_sc.sc_r11 = tf->tf_r11;
frame.sf_sc.sc_r12 = tf->tf_r12;
frame.sf_sc.sc_usr_sp = tf->tf_usr_sp;
frame.sf_sc.sc_usr_lr = tf->tf_usr_lr;
frame.sf_sc.sc_svc_lr = tf->tf_svc_lr;
frame.sf_sc.sc_pc = tf->tf_pc;
frame.sf_sc.sc_spsr = tf->tf_spsr;
if (copyout(&frame, fp, sizeof(frame)) != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
sigexit(p, SIGILL);
/* NOTREACHED */
}
/*
* Build context to run handler in.
*/
tf->tf_r0 = frame.sf_signum;
tf->tf_r1 = frame.sf_code;
tf->tf_r2 = (u_int)frame.sf_scp;
tf->tf_r3 = (u_int)frame.sf_handler;
tf->tf_usr_sp = (int)fp;
tf->tf_pc = (int)(((char *)PS_STRINGS) - (esigcode - sigcode));
if (pmap_debug_level >= 0)
printf("Sendsig: sig=%d pc=%08x\n", sig, tf->tf_pc);
}
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by sendsig (above).
* Return to previous pc and psl as specified by
* context left by sendsig. Check carefully to
* make sure that the user has not modified the
* psr to gain improper privileges or to cause
* a machine fault.
*/
int
sys_sigreturn(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_sigreturn_args /* {
syscallarg(struct sigcontext *) sigcntxp;
} */ *uap = v;
struct sigcontext *scp, context;
/* register struct sigframe *fp;*/
register struct trapframe *tf;
if (pmap_debug_level >= 0)
printf("sigreturn: context=%08x\n", (int)SCARG(uap, sigcntxp));
tf = p->p_md.md_regs;
/*
* The trampoline code hands us the context.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
scp = SCARG(uap, sigcntxp);
if (copyin((caddr_t)scp, &context, sizeof(*scp)) != 0)
return (EFAULT);
/*
* Check for security violations.
*/
/* Make sure the processor mode has not been tampered with */
if ((context.sc_spsr & PSR_MODE) != PSR_USR32_MODE)
return(EINVAL);
if (context.sc_onstack & 01)
p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK;
else
p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK;
p->p_sigmask = context.sc_mask & ~sigcantmask;
/*
* Restore signal context.
*/
tf->tf_r0 = context.sc_r0;
tf->tf_r1 = context.sc_r1;
tf->tf_r2 = context.sc_r2;
tf->tf_r3 = context.sc_r3;
tf->tf_r4 = context.sc_r4;
tf->tf_r5 = context.sc_r5;
tf->tf_r6 = context.sc_r6;
tf->tf_r7 = context.sc_r7;
tf->tf_r8 = context.sc_r8;
tf->tf_r9 = context.sc_r9;
tf->tf_r10 = context.sc_r10;
tf->tf_r11 = context.sc_r11;
tf->tf_r12 = context.sc_r12;
tf->tf_usr_sp = context.sc_usr_sp;
tf->tf_usr_lr = context.sc_usr_lr;
tf->tf_svc_lr = context.sc_svc_lr;
tf->tf_pc = context.sc_pc;
tf->tf_spsr = context.sc_spsr;
#ifdef VALIDATE_TRAPFRAME
validate_trapframe(tf, 6);
#endif
return (EJUSTRETURN);
}
/*
* machine dependent system variables.
*/
int
cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
printf("cpu_sysctl: Currently stoned - Cannot support the operation\n");
return(EOPNOTSUPP);
}
/*
* Ok these are some development functions. They map blocks of memory
* into the video ram virtual memory.
* The idea is to follow this with a call to the vidc device to
* reinitialise the vidc20 for the new video ram.
*/
/* Map DRAM into the video memory */
int
vmem_mapdram()
{
u_int l2pagetable;
u_int logical;
if (videodram_start == 0 || videodram_size == 0)
return(ENOMEM);
/* Flush any video data in the cache */
idcflush();
/* Get the level 2 pagetable for the video memory */
l2pagetable = (u_int)pmap_pte(kernel_pmap,
(vm_offset_t)videomemory.vidm_vbase);
/* Map a block of DRAM into the video memory area */
for (logical = 0; logical < 0x200000; logical += NBPG) {
map_entry(l2pagetable, logical, videodram_start
+ logical);
map_entry(l2pagetable, logical + 0x200000,
videodram_start + logical);
}
/* Flush the TLB so we pick up the new mappings */
tlbflush();
/* Rebuild the video memory descriptor */
videomemory.vidm_vbase = VMEM_VBASE;
videomemory.vidm_pbase = videodram_start;
videomemory.vidm_type = VIDEOMEM_TYPE_DRAM;
videomemory.vidm_size = videodram_size;
/* Reinitialise the video system */
/* video_reinit();*/
return(0);
}
/* Map VRAM into the video memory */
int
vmem_mapvram()
{
u_int l2pagetable;
u_int logical;
if (bootconfig.vram[0].address == 0 || bootconfig.vram[0].pages == 0)
return(ENOMEM);
/* Flush any video data in the cache */
idcflush();
/* Get the level 2 pagetable for the video memory */
l2pagetable = (u_int)pmap_pte(kernel_pmap,
(vm_offset_t)videomemory.vidm_vbase);
/* Map the VRAM into the video memory area */
for (logical = 0; logical < 0x200000; logical += NBPG) {
map_entry(l2pagetable, logical, bootconfig.vram[0].address
+ logical);
map_entry(l2pagetable, logical + 0x200000,
bootconfig.vram[0].address + logical);
}
/* Flush the TLB so we pick up the new mappings */
tlbflush();
/* Rebuild the video memory descriptor */
videomemory.vidm_vbase = VMEM_VBASE;
videomemory.vidm_pbase = VRAM_BASE;
videomemory.vidm_type = VIDEOMEM_TYPE_VRAM;
videomemory.vidm_size = bootconfig.vram[0].pages * NBPG;
/* Reinitialise the video system */
/* video_reinit();*/
return(0);
}
/* Set the cache behaviour for the video memory */
int
vmem_cachectl(flag)
int flag;
{
u_int l2pagetable;
u_int logical;
if (bootconfig.vram[0].address == 0 || bootconfig.vram[0].pages == 0)
return(ENOMEM);
/* Flush any video data in the cache */
idcflush();
/* Get the level 2 pagetable for the video memory */
l2pagetable = (u_int)pmap_pte(kernel_pmap,
(vm_offset_t)videomemory.vidm_vbase);
/* Map the VRAM into the video memory area */
if (flag & 1) {
for (logical = 0; logical < 0x200000; logical += NBPG) {
map_entry(l2pagetable, logical, bootconfig.vram[0].address
+ logical);
map_entry(l2pagetable, logical + 0x200000,
bootconfig.vram[0].address + logical);
}
} else {
for (logical = 0; logical < 0x200000; logical += NBPG) {
map_entry_nc(l2pagetable, logical, bootconfig.vram[0].address
+ logical);
map_entry_nc(l2pagetable, logical + 0x200000,
bootconfig.vram[0].address + logical);
}
}
/* Flush the TLB so we pick up the new mappings */
tlbflush();
return(0);
}
#if 0
extern int vtvalbug;
extern char *vtlastbug;
extern u_int vtbugaddr;
extern u_int vtbugcaddr;
void
vtbugreport()
{
printf("vtvalbug = %d\n", vtvalbug);
if (vtlastbug)
printf("vtlastbug = %s\n", vtlastbug);
printf("vtbugaddr = %08x\n", vtbugaddr);
printf("vtbugcaddr = %08x\n", vtbugcaddr);
}
#endif
/* End of machdep.c */
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