Commit 6ae81775 authored by ths's avatar ths
Browse files

Halt/reboot support for Linux, by Daniel Jacobowitz. This is a band-aid

until we emulate real MIPS hardware with real firmware.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2221 c046a42c-6fe2-441c-8c8c-71466251a162
parent 814b9a47
......@@ -110,6 +110,93 @@ void cpu_mips_clock_init (CPUState *env)
cpu_mips_update_count(env, 1, 0);
}
static void mips_qemu_writel (void *opaque, target_phys_addr_t addr,
uint32_t val)
{
if ((addr & 0xffff) == 0 && val == 42)
qemu_system_reset_request ();
else if ((addr & 0xffff) == 4 && val == 42)
qemu_system_shutdown_request ();
}
static uint32_t mips_qemu_readl (void *opaque, target_phys_addr_t addr)
{
return 0;
}
static CPUWriteMemoryFunc *mips_qemu_write[] = {
&mips_qemu_writel,
&mips_qemu_writel,
&mips_qemu_writel,
};
static CPUReadMemoryFunc *mips_qemu_read[] = {
&mips_qemu_readl,
&mips_qemu_readl,
&mips_qemu_readl,
};
static int mips_qemu_iomemtype = 0;
void load_kernel (CPUState *env, int ram_size, const char *kernel_filename,
const char *kernel_cmdline,
const char *initrd_filename)
{
int64_t entry = 0;
long kernel_size, initrd_size;
kernel_size = load_elf(kernel_filename, VIRT_TO_PHYS_ADDEND, &entry);
if (kernel_size >= 0)
env->PC = entry;
else {
kernel_size = load_image(kernel_filename,
phys_ram_base + KERNEL_LOAD_ADDR + VIRT_TO_PHYS_ADDEND);
if (kernel_size < 0) {
fprintf(stderr, "qemu: could not load kernel '%s'\n",
kernel_filename);
exit(1);
}
env->PC = KERNEL_LOAD_ADDR;
}
/* load initrd */
initrd_size = 0;
if (initrd_filename) {
initrd_size = load_image(initrd_filename,
phys_ram_base + INITRD_LOAD_ADDR + VIRT_TO_PHYS_ADDEND);
if (initrd_size == (target_ulong) -1) {
fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
initrd_filename);
exit(1);
}
}
/* Store command line. */
if (initrd_size > 0) {
int ret;
ret = sprintf(phys_ram_base + (16 << 20) - 256,
"rd_start=0x%08x rd_size=%li ",
INITRD_LOAD_ADDR,
initrd_size);
strcpy (phys_ram_base + (16 << 20) - 256 + ret, kernel_cmdline);
}
else {
strcpy (phys_ram_base + (16 << 20) - 256, kernel_cmdline);
}
*(int *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);
*(int *)(phys_ram_base + (16 << 20) - 264) = tswap32 (ram_size);
}
static void main_cpu_reset(void *opaque)
{
CPUState *env = opaque;
cpu_reset(env);
if (env->kernel_filename)
load_kernel (env, env->ram_size, env->kernel_filename,
env->kernel_cmdline, env->initrd_filename);
}
void mips_r4k_init (int ram_size, int vga_ram_size, int boot_device,
DisplayState *ds, const char **fd_filename, int snapshot,
......@@ -117,19 +204,24 @@ void mips_r4k_init (int ram_size, int vga_ram_size, int boot_device,
const char *initrd_filename)
{
char buf[1024];
int64_t entry = 0;
unsigned long bios_offset;
int ret;
CPUState *env;
long kernel_size;
int i;
env = cpu_init();
register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
qemu_register_reset(main_cpu_reset, env);
/* allocate RAM */
cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
if (!mips_qemu_iomemtype) {
mips_qemu_iomemtype = cpu_register_io_memory(0, mips_qemu_read,
mips_qemu_write, NULL);
}
cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);
/* Try to load a BIOS image. If this fails, we continue regardless,
but initialize the hardware ourselves. When a kernel gets
preloaded we also initialize the hardware, since the BIOS wasn't
......@@ -146,38 +238,13 @@ void mips_r4k_init (int ram_size, int vga_ram_size, int boot_device,
buf);
}
kernel_size = 0;
if (kernel_filename) {
kernel_size = load_elf(kernel_filename, VIRT_TO_PHYS_ADDEND, &entry);
if (kernel_size >= 0)
env->PC = entry;
else {
kernel_size = load_image(kernel_filename,
phys_ram_base + KERNEL_LOAD_ADDR + VIRT_TO_PHYS_ADDEND);
if (kernel_size < 0) {
fprintf(stderr, "qemu: could not load kernel '%s'\n",
kernel_filename);
exit(1);
}
env->PC = KERNEL_LOAD_ADDR;
}
/* load initrd */
if (initrd_filename) {
if (load_image(initrd_filename,
phys_ram_base + INITRD_LOAD_ADDR + VIRT_TO_PHYS_ADDEND)
== (target_ulong) -1) {
fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
initrd_filename);
exit(1);
}
}
/* Store command line. */
strcpy (phys_ram_base + (16 << 20) - 256, kernel_cmdline);
/* FIXME: little endian support */
*(int *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);
*(int *)(phys_ram_base + (16 << 20) - 264) = tswap32 (ram_size);
load_kernel (env, ram_size, kernel_filename, kernel_cmdline,
initrd_filename);
env->ram_size = ram_size;
env->kernel_filename = kernel_filename;
env->kernel_cmdline = kernel_cmdline;
env->initrd_filename = initrd_filename;
}
/* Init internal devices */
......
......@@ -182,7 +182,6 @@ struct CPUMIPSState {
uint32_t CP0_ErrorEPC;
uint32_t CP0_DESAVE;
/* Qemu */
struct QEMUTimer *timer; /* Internal timer */
int interrupt_request;
jmp_buf jmp_env;
int exception_index;
......@@ -213,6 +212,13 @@ struct CPUMIPSState {
int halted; /* TRUE if the CPU is in suspend state */
CPU_COMMON
int ram_size;
const char *kernel_filename;
const char *kernel_cmdline;
const char *initrd_filename;
struct QEMUTimer *timer; /* Internal timer */
};
#include "cpu-all.h"
......
......@@ -2425,7 +2425,16 @@ CPUMIPSState *cpu_mips_init (void)
if (!env)
return NULL;
cpu_exec_init(env);
cpu_reset(env);
return env;
}
void cpu_reset (CPUMIPSState *env)
{
memset(env, 0, offsetof(CPUMIPSState, breakpoints));
tlb_flush(env, 1);
/* Minimal init */
env->PC = 0xBFC00000;
#if defined (MIPS_USES_R4K_TLB)
......@@ -2456,5 +2465,4 @@ CPUMIPSState *cpu_mips_init (void)
#ifdef MIPS_USES_FPU
env->fcr0 = MIPS_FCR0;
#endif
return env;
}
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