49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
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#ifndef AMD64_CONTEXT_H
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#define AMD64_CONTEXT_H
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struct context {
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/* Stack Segment, placed here because of the alignment issue... */
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uint16_t ss;
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/* Used with sgdt/lgdt */
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uint16_t gdt_limit;
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uint64_t gdt_base;
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/* General registers, accessed with pushal/popal */
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uint32_t edi;
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uint32_t esi;
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uint32_t ebp;
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uint32_t esp; /* points just below eax */
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uint32_t ebx;
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uint32_t edx;
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uint32_t ecx;
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uint32_t eax;
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#define ESP_LOC(ctx) (&(ctx)->gs)
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/* Segment registers */
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uint32_t gs;
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uint32_t fs;
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uint32_t es;
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uint32_t ds;
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/* Flags */
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uint32_t eflags;
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/* Code segment:offset */
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uint32_t eip;
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uint32_t cs;
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/* Optional stack contents */
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uint32_t return_addr;
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uint32_t param[0];
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};
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/* Create a new context in the given stack */
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struct context *
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init_context(uint8_t *stack, uint32_t stack_size, int num_param);
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/* Switch context */
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struct context *switch_to(struct context *);
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/* Holds physical address of boot context */
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extern unsigned long __boot_ctx;
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/* This can always be safely used to refer to the boot context */
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#define boot_ctx ((struct context *) phys_to_virt(__boot_ctx))
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#endif /* AMD64_CONTEXT_H */
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