qemu/pc-bios/s390-ccw/s390-ccw.h

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/*
* S390 CCW boot loader
*
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#ifndef S390_CCW_H
#define S390_CCW_H
/* #define DEBUG */
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;
typedef unsigned long ulong;
typedef unsigned char __u8;
typedef unsigned short __u16;
typedef unsigned int __u32;
typedef unsigned long long __u64;
#define true 1
#define false 0
#define PAGE_SIZE 4096
#define EIO 1
#define EBUSY 2
#define ENODEV 3
#ifndef NULL
#define NULL 0
#endif
#ifndef MIN
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MIN_NON_ZERO
#define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \
((b) == 0 ? (a) : (MIN(a, b))))
#endif
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#include "cio.h"
#include "iplb.h"
/* start.s */
void disabled_wait(void) __attribute__ ((__noreturn__));
void consume_sclp_int(void);
void consume_io_int(void);
/* main.c */
void write_subsystem_identification(void);
void write_iplb_location(void);
extern char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
unsigned int get_loadparm_index(void);
/* sclp.c */
void sclp_print(const char *string);
void sclp_set_write_mask(uint32_t receive_mask, uint32_t send_mask);
void sclp_setup(void);
void sclp_get_loadparm_ascii(char *loadparm);
int sclp_read(char *str, size_t count);
/* virtio.c */
unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
ulong subchan_id, void *load_addr);
bool virtio_is_supported(SubChannelId schid);
int virtio_blk_setup_device(SubChannelId schid);
int virtio_read(ulong sector, void *load_addr);
/* bootmap.c */
void zipl_load(void);
pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS The netboot firmware so far simply jumped directly into the OS kernel after the download has been completed. This, however, bears the risk that the virtio-net device still might be active in the background and incoming packets are still placed into the buffers - which could destroy memory of the now-running Linux kernel in case it did not take over the device fast enough. Also the SCLP console is not put into a well-defined state here. We should hand over the system in a clean state when jumping into the kernel, so let's use the same mechanism as it's done in the main s390-ccw firmware and reset the machine with diag308 into a clean state before jumping into the OS kernel code. To be able to share the code with the main s390-ccw firmware, the related functions are now extracted from bootmap.c into a new file called jump2ipl.c. Since we now also set the boot device schid at address 184 for the network boot device, this patch also slightly changes the way how we detect the entry points for non-ELF binary images: The code now looks for the "S390EP" magic first and then jumps to 0x10000 in case it has been found. This is necessary for booting from network devices, since the normal kernel code (where the PSW at ddress 0 points to) tries to do a block load from the boot device. This of course fails for a virtio-net device and causes the kernel to abort with a panic-PSW silently. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2018-04-20 12:30:42 +03:00
/* jump2ipl.c */
void write_reset_psw(uint64_t psw);
pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS The netboot firmware so far simply jumped directly into the OS kernel after the download has been completed. This, however, bears the risk that the virtio-net device still might be active in the background and incoming packets are still placed into the buffers - which could destroy memory of the now-running Linux kernel in case it did not take over the device fast enough. Also the SCLP console is not put into a well-defined state here. We should hand over the system in a clean state when jumping into the kernel, so let's use the same mechanism as it's done in the main s390-ccw firmware and reset the machine with diag308 into a clean state before jumping into the OS kernel code. To be able to share the code with the main s390-ccw firmware, the related functions are now extracted from bootmap.c into a new file called jump2ipl.c. Since we now also set the boot device schid at address 184 for the network boot device, this patch also slightly changes the way how we detect the entry points for non-ELF binary images: The code now looks for the "S390EP" magic first and then jumps to 0x10000 in case it has been found. This is necessary for booting from network devices, since the normal kernel code (where the PSW at ddress 0 points to) tries to do a block load from the boot device. This of course fails for a virtio-net device and causes the kernel to abort with a panic-PSW silently. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2018-04-20 12:30:42 +03:00
void jump_to_IPL_code(uint64_t address);
void jump_to_low_kernel(void);
/* menu.c */
void menu_set_parms(uint8_t boot_menu_flag, uint32_t boot_menu_timeout);
int menu_get_zipl_boot_index(const char *menu_data);
bool menu_is_enabled_zipl(void);
int menu_get_enum_boot_index(bool *valid_entries);
bool menu_is_enabled_enum(void);
#define MAX_BOOT_ENTRIES 31
static inline void panic(const char *string)
{
sclp_print(string);
disabled_wait();
}
static inline void fill_hex(char *out, unsigned char val)
{
const char hex[] = "0123456789abcdef";
out[0] = hex[(val >> 4) & 0xf];
out[1] = hex[val & 0xf];
}
static inline void fill_hex_val(char *out, void *ptr, unsigned size)
{
unsigned char *value = ptr;
unsigned int i;
for (i = 0; i < size; i++) {
fill_hex(&out[i*2], value[i]);
}
}
static inline void print_int(const char *desc, u64 addr)
{
char out[] = ": 0xffffffffffffffff\n";
fill_hex_val(&out[4], &addr, sizeof(addr));
sclp_print(desc);
sclp_print(out);
}
static inline void debug_print_int(const char *desc, u64 addr)
{
#ifdef DEBUG
print_int(desc, addr);
#endif
}
static inline void debug_print_addr(const char *desc, void *p)
{
#ifdef DEBUG
debug_print_int(desc, (unsigned int)(unsigned long)p);
#endif
}
/***********************************************
* Hypercall functions *
***********************************************/
#define KVM_S390_VIRTIO_NOTIFY 0
#define KVM_S390_VIRTIO_RESET 1
#define KVM_S390_VIRTIO_SET_STATUS 2
#define KVM_S390_VIRTIO_CCW_NOTIFY 3
#define MAX_SECTOR_SIZE 4096
static inline void IPL_assert(bool term, const char *message)
{
if (!term) {
sclp_print("\n! ");
sclp_print(message);
panic(" !\n"); /* no return */
}
}
static inline void IPL_check(bool term, const char *message)
{
if (!term) {
sclp_print("\n! WARNING: ");
sclp_print(message);
sclp_print(" !\n");
}
}
extern const unsigned char ebc2asc[256];
static inline void ebcdic_to_ascii(const char *src,
char *dst,
unsigned int size)
{
unsigned int i;
for (i = 0; i < size; i++) {
unsigned c = src[i];
dst[i] = ebc2asc[c];
}
}
#endif /* S390_CCW_H */