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Diffstat (limited to 'qemu/roms/openbios/arch/amd64/context.h')
-rw-r--r--qemu/roms/openbios/arch/amd64/context.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/qemu/roms/openbios/arch/amd64/context.h b/qemu/roms/openbios/arch/amd64/context.h
new file mode 100644
index 000000000..4c3832efb
--- /dev/null
+++ b/qemu/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 */