qemu/hw/m68k/mcf5208.c

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/*
* Motorola ColdFire MCF5208 SoC emulation.
*
* Copyright (c) 2007 CodeSourcery.
*
* This code is licensed under the GPL
*/
#include "qemu/osdep.h"
2016-03-14 11:01:28 +03:00
#include "qapi/error.h"
#include "qemu-common.h"
#include "cpu.h"
#include "hw/hw.h"
#include "hw/m68k/mcf.h"
#include "qemu/timer.h"
#include "hw/ptimer.h"
#include "sysemu/sysemu.h"
#include "sysemu/qtest.h"
#include "net/net.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "elf.h"
#include "exec/address-spaces.h"
#define SYS_FREQ 66000000
#define PCSR_EN 0x0001
#define PCSR_RLD 0x0002
#define PCSR_PIF 0x0004
#define PCSR_PIE 0x0008
#define PCSR_OVW 0x0010
#define PCSR_DBG 0x0020
#define PCSR_DOZE 0x0040
#define PCSR_PRE_SHIFT 8
#define PCSR_PRE_MASK 0x0f00
typedef struct {
MemoryRegion iomem;
qemu_irq irq;
ptimer_state *timer;
uint16_t pcsr;
uint16_t pmr;
uint16_t pcntr;
} m5208_timer_state;
static void m5208_timer_update(m5208_timer_state *s)
{
if ((s->pcsr & (PCSR_PIE | PCSR_PIF)) == (PCSR_PIE | PCSR_PIF))
qemu_irq_raise(s->irq);
else
qemu_irq_lower(s->irq);
}
static void m5208_timer_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
m5208_timer_state *s = (m5208_timer_state *)opaque;
int prescale;
int limit;
switch (offset) {
case 0:
/* The PIF bit is set-to-clear. */
if (value & PCSR_PIF) {
s->pcsr &= ~PCSR_PIF;
value &= ~PCSR_PIF;
}
/* Avoid frobbing the timer if we're just twiddling IRQ bits. */
if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {
s->pcsr = value;
m5208_timer_update(s);
return;
}
if (s->pcsr & PCSR_EN)
ptimer_stop(s->timer);
s->pcsr = value;
prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);
ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);
if (s->pcsr & PCSR_RLD)
limit = s->pmr;
else
limit = 0xffff;
ptimer_set_limit(s->timer, limit, 0);
if (s->pcsr & PCSR_EN)
ptimer_run(s->timer, 0);
break;
case 2:
s->pmr = value;
s->pcsr &= ~PCSR_PIF;
if ((s->pcsr & PCSR_RLD) == 0) {
if (s->pcsr & PCSR_OVW)
ptimer_set_count(s->timer, value);
} else {
ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);
}
break;
case 4:
break;
default:
hw_error("m5208_timer_write: Bad offset 0x%x\n", (int)offset);
break;
}
m5208_timer_update(s);
}
static void m5208_timer_trigger(void *opaque)
{
m5208_timer_state *s = (m5208_timer_state *)opaque;
s->pcsr |= PCSR_PIF;
m5208_timer_update(s);
}
static uint64_t m5208_timer_read(void *opaque, hwaddr addr,
unsigned size)
{
m5208_timer_state *s = (m5208_timer_state *)opaque;
switch (addr) {
case 0:
return s->pcsr;
case 2:
return s->pmr;
case 4:
return ptimer_get_count(s->timer);
default:
hw_error("m5208_timer_read: Bad offset 0x%x\n", (int)addr);
return 0;
}
}
static const MemoryRegionOps m5208_timer_ops = {
.read = m5208_timer_read,
.write = m5208_timer_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static uint64_t m5208_sys_read(void *opaque, hwaddr addr,
unsigned size)
{
switch (addr) {
case 0x110: /* SDCS0 */
{
int n;
for (n = 0; n < 32; n++) {
if (ram_size < (2u << n))
break;
}
return (n - 1) | 0x40000000;
}
case 0x114: /* SDCS1 */
return 0;
default:
hw_error("m5208_sys_read: Bad offset 0x%x\n", (int)addr);
return 0;
}
}
static void m5208_sys_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
hw_error("m5208_sys_write: Bad offset 0x%x\n", (int)addr);
}
static const MemoryRegionOps m5208_sys_ops = {
.read = m5208_sys_read,
.write = m5208_sys_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
{
MemoryRegion *iomem = g_new(MemoryRegion, 1);
m5208_timer_state *s;
QEMUBH *bh;
int i;
/* SDRAMC. */
memory_region_init_io(iomem, NULL, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);
memory_region_add_subregion(address_space, 0xfc0a8000, iomem);
/* Timers. */
for (i = 0; i < 2; i++) {
s = (m5208_timer_state *)g_malloc0(sizeof(m5208_timer_state));
bh = qemu_bh_new(m5208_timer_trigger, s);
s->timer = ptimer_init(bh);
memory_region_init_io(&s->iomem, NULL, &m5208_timer_ops, s,
"m5208-timer", 0x00004000);
memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,
&s->iomem);
s->irq = pic[4 + i];
}
}
static void mcf5208evb_init(MachineState *machine)
{
ram_addr_t ram_size = machine->ram_size;
const char *cpu_model = machine->cpu_model;
const char *kernel_filename = machine->kernel_filename;
M68kCPU *cpu;
CPUM68KState *env;
int kernel_size;
uint64_t elf_entry;
hwaddr entry;
qemu_irq *pic;
MemoryRegion *address_space_mem = get_system_memory();
MemoryRegion *ram = g_new(MemoryRegion, 1);
MemoryRegion *sram = g_new(MemoryRegion, 1);
if (!cpu_model) {
cpu_model = "m5208";
}
cpu = cpu_m68k_init(cpu_model);
if (!cpu) {
fprintf(stderr, "Unable to find m68k CPU definition\n");
exit(1);
}
env = &cpu->env;
/* Initialize CPU registers. */
env->vbr = 0;
/* TODO: Configure BARs. */
/* DRAM at 0x40000000 */
memory_region_allocate_system_memory(ram, NULL, "mcf5208.ram", ram_size);
memory_region_add_subregion(address_space_mem, 0x40000000, ram);
/* Internal SRAM. */
Fix bad error handling after memory_region_init_ram() Symptom: $ qemu-system-x86_64 -m 10000000 Unexpected error in ram_block_add() at /work/armbru/qemu/exec.c:1456: upstream-qemu: cannot set up guest memory 'pc.ram': Cannot allocate memory Aborted (core dumped) Root cause: commit ef701d7 screwed up handling of out-of-memory conditions. Before the commit, we report the error and exit(1), in one place, ram_block_add(). The commit lifts the error handling up the call chain some, to three places. Fine. Except it uses &error_abort in these places, changing the behavior from exit(1) to abort(), and thus undoing the work of commit 3922825 "exec: Don't abort when we can't allocate guest memory". The three places are: * memory_region_init_ram() Commit 4994653 (right after commit ef701d7) lifted the error handling further, through memory_region_init_ram(), multiplying the incorrect use of &error_abort. Later on, imitation of existing (bad) code may have created more. * memory_region_init_ram_ptr() The &error_abort is still there. * memory_region_init_rom_device() Doesn't need fixing, because commit 33e0eb5 (soon after commit ef701d7) lifted the error handling further, and in the process changed it from &error_abort to passing it up the call chain. Correct, because the callers are realize() methods. Fix the error handling after memory_region_init_ram() with a Coccinelle semantic patch: @r@ expression mr, owner, name, size, err; position p; @@ memory_region_init_ram(mr, owner, name, size, ( - &error_abort + &error_fatal | err@p ) ); @script:python@ p << r.p; @@ print "%s:%s:%s" % (p[0].file, p[0].line, p[0].column) When the last argument is &error_abort, it gets replaced by &error_fatal. This is the fix. If the last argument is anything else, its position is reported. This lets us check the fix is complete. Four positions get reported: * ram_backend_memory_alloc() Error is passed up the call chain, ultimately through user_creatable_complete(). As far as I can tell, it's callers all handle the error sanely. * fsl_imx25_realize(), fsl_imx31_realize(), dp8393x_realize() DeviceClass.realize() methods, errors handled sanely further up the call chain. We're good. Test case again behaves: $ qemu-system-x86_64 -m 10000000 qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot allocate memory [Exit 1 ] The next commits will repair the rest of commit ef701d7's damage. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1441983105-26376-3-git-send-email-armbru@redhat.com> Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
2015-09-11 17:51:43 +03:00
memory_region_init_ram(sram, NULL, "mcf5208.sram", 16384, &error_fatal);
vmstate_register_ram_global(sram);
memory_region_add_subregion(address_space_mem, 0x80000000, sram);
/* Internal peripherals. */
pic = mcf_intc_init(address_space_mem, 0xfc048000, cpu);
mcf_uart_mm_init(address_space_mem, 0xfc060000, pic[26], serial_hds[0]);
mcf_uart_mm_init(address_space_mem, 0xfc064000, pic[27], serial_hds[1]);
mcf_uart_mm_init(address_space_mem, 0xfc068000, pic[28], serial_hds[2]);
mcf5208_sys_init(address_space_mem, pic);
if (nb_nics > 1) {
fprintf(stderr, "Too many NICs\n");
exit(1);
}
if (nd_table[0].used)
mcf_fec_init(address_space_mem, &nd_table[0],
0xfc030000, pic + 36);
/* 0xfc000000 SCM. */
/* 0xfc004000 XBS. */
/* 0xfc008000 FlexBus CS. */
/* 0xfc030000 FEC. */
/* 0xfc040000 SCM + Power management. */
/* 0xfc044000 eDMA. */
/* 0xfc048000 INTC. */
/* 0xfc058000 I2C. */
/* 0xfc05c000 QSPI. */
/* 0xfc060000 UART0. */
/* 0xfc064000 UART0. */
/* 0xfc068000 UART0. */
/* 0xfc070000 DMA timers. */
/* 0xfc080000 PIT0. */
/* 0xfc084000 PIT1. */
/* 0xfc088000 EPORT. */
/* 0xfc08c000 Watchdog. */
/* 0xfc090000 clock module. */
/* 0xfc0a0000 CCM + reset. */
/* 0xfc0a4000 GPIO. */
/* 0xfc0a8000 SDRAM controller. */
/* Load kernel. */
if (!kernel_filename) {
if (qtest_enabled()) {
return;
}
fprintf(stderr, "Kernel image must be specified\n");
exit(1);
}
kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
NULL, NULL, 1, EM_68K, 0, 0);
entry = elf_entry;
if (kernel_size < 0) {
kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
NULL, NULL);
}
if (kernel_size < 0) {
kernel_size = load_image_targphys(kernel_filename, 0x40000000,
ram_size);
entry = 0x40000000;
}
if (kernel_size < 0) {
fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
exit(1);
}
env->pc = entry;
}
static void mcf5208evb_machine_init(MachineClass *mc)
{
mc->desc = "MCF5206EVB";
mc->init = mcf5208evb_init;
mc->is_default = 1;
}
DEFINE_MACHINE("mcf5208evb", mcf5208evb_machine_init)