diff options
Diffstat (limited to 'qemu/roms/openbios/arch/amd64/context.c')
-rw-r--r-- | qemu/roms/openbios/arch/amd64/context.c | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/qemu/roms/openbios/arch/amd64/context.c b/qemu/roms/openbios/arch/amd64/context.c deleted file mode 100644 index 2e4df6a3d..000000000 --- a/qemu/roms/openbios/arch/amd64/context.c +++ /dev/null @@ -1,124 +0,0 @@ -/* - * context switching - * 2003-10 by SONE Takeshi - */ - -#include "config.h" -#include "kernel/kernel.h" -#include "segment.h" -#include "context.h" - -#define MAIN_STACK_SIZE 16384 -#define IMAGE_STACK_SIZE 4096 - -#define debug printk - -static void start_main(void); /* forward decl. */ -void __exit_context(void); /* assembly routine */ - -/* - * Main context structure - * It is placed at the bottom of our stack, and loaded by assembly routine - * to start us up. - */ -struct context main_ctx __attribute__((section (".initctx"))) = { - .gdt_base = (uint64_t) gdt, - .gdt_limit = GDT_LIMIT, - .cs = FLAT_CS, - .ds = FLAT_DS, - .es = FLAT_DS, - .fs = FLAT_DS, - .gs = FLAT_DS, - .ss = FLAT_DS, - .esp = (uint32_t) ESP_LOC(&main_ctx), - .eip = (uint32_t) start_main, - .return_addr = (uint32_t) __exit_context, -}; - -/* This is used by assembly routine to load/store the context which - * it is to switch/switched. */ -struct context *__context = &main_ctx; - -/* Stack for loaded ELF image */ -static uint8_t image_stack[IMAGE_STACK_SIZE]; - -/* Pointer to startup context (physical address) */ -unsigned long __boot_ctx; - -/* - * Main starter - * This is the C function that runs first. - */ -static void start_main(void) -{ - int retval; - extern int openbios(void); - - /* Save startup context, so we can refer to it later. - * We have to keep it in physical address since we will relocate. */ - __boot_ctx = virt_to_phys(__context); - - /* Start the real fun */ - retval = openbios(); - - /* Pass return value to startup context. Bootloader may see it. */ - boot_ctx->eax = retval; - - /* Returning from here should jump to __exit_context */ - __context = boot_ctx; -} - -/* Setup a new context using the given stack. - */ -struct context * -init_context(uint8_t *stack, uint32_t stack_size, int num_params) -{ - struct context *ctx; - - ctx = (struct context *) - (stack + stack_size - (sizeof(*ctx) + num_params*sizeof(uint32_t))); - memset(ctx, 0, sizeof(*ctx)); - - /* Fill in reasonable default for flat memory model */ - ctx->gdt_base = virt_to_phys(gdt); - ctx->gdt_limit = GDT_LIMIT; - ctx->cs = FLAT_CS; - ctx->ds = FLAT_DS; - ctx->es = FLAT_DS; - ctx->fs = FLAT_DS; - ctx->gs = FLAT_DS; - ctx->ss = FLAT_DS; - ctx->esp = virt_to_phys(ESP_LOC(ctx)); - ctx->return_addr = virt_to_phys(__exit_context); - - return ctx; -} - -/* Switch to another context. */ -struct context *switch_to(struct context *ctx) -{ - struct context *save, *ret; - - debug("switching to new context:\n"); - save = __context; - __context = ctx; - asm ("pushl %cs; call __switch_context"); - ret = __context; - __context = save; - return ret; -} - -/* Start ELF Boot image */ -uint32_t start_elf(uint32_t entry_point, uint32_t param) -{ - struct context *ctx; - - ctx = init_context(image_stack, sizeof image_stack, 1); - ctx->eip = entry_point; - ctx->param[0] = param; - ctx->eax = 0xe1fb007; - ctx->ebx = param; - - ctx = switch_to(ctx); - return ctx->eax; -} |