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| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/openbios/arch/amd64/context.h | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/openbios/arch/amd64/context.h')
| -rw-r--r-- | roms/openbios/arch/amd64/context.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/roms/openbios/arch/amd64/context.h b/roms/openbios/arch/amd64/context.h new file mode 100644 index 000000000..4c3832efb --- /dev/null +++ b/roms/openbios/arch/amd64/context.h @@ -0,0 +1,48 @@ +#ifndef AMD64_CONTEXT_H +#define AMD64_CONTEXT_H + +struct context { + /* Stack Segment, placed here because of the alignment issue... */ + uint16_t ss; + /* Used with sgdt/lgdt */ + uint16_t gdt_limit; + uint64_t gdt_base; + /* General registers, accessed with pushal/popal */ + uint32_t edi; + uint32_t esi; + uint32_t ebp; + uint32_t esp; /* points just below eax */ + uint32_t ebx; + uint32_t edx; + uint32_t ecx; + uint32_t eax; +#define ESP_LOC(ctx) (&(ctx)->gs) + /* Segment registers */ + uint32_t gs; + uint32_t fs; + uint32_t es; + uint32_t ds; + /* Flags */ + uint32_t eflags; + /* Code segment:offset */ + uint32_t eip; + uint32_t cs; + /* Optional stack contents */ + uint32_t return_addr; + uint32_t param[0]; +}; + +/* Create a new context in the given stack */ +struct context * +init_context(uint8_t *stack, uint32_t stack_size, int num_param); + +/* Switch context */ +struct context *switch_to(struct context *); + +/* Holds physical address of boot context */ +extern unsigned long __boot_ctx; + +/* This can always be safely used to refer to the boot context */ +#define boot_ctx ((struct context *) phys_to_virt(__boot_ctx)) + +#endif /* AMD64_CONTEXT_H */ |