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#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 */
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