From 95606a6be7c64065d295bdabb1a94fb42108e72f Mon Sep 17 00:00:00 2001 From: Danny Holman Date: Fri, 16 Feb 2024 13:04:01 -0600 Subject: arch: i386: move GDT definitions to their own header Move all the data structures required for operation of the GDT to their own header file. Signed-off-by: Danny Holman --- arch/i386/include/kernel/gdt.h | 55 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 arch/i386/include/kernel/gdt.h diff --git a/arch/i386/include/kernel/gdt.h b/arch/i386/include/kernel/gdt.h new file mode 100644 index 0000000..532881a --- /dev/null +++ b/arch/i386/include/kernel/gdt.h @@ -0,0 +1,55 @@ +#ifndef I386_GDT_H +#define I386_GDT_H + +#include + +struct gdt_entry { + uint16_t limit_low; + uint16_t base_low; + uint8_t base_middle; + uint8_t access; + uint8_t gran; + uint8_t base_high; +} __attribute__((packed)); + +struct gdt_ptr { + uint16_t limit; + uint32_t base; +} __attribute__((packed)); + +struct tss_entry { + uint32_t link; + uint32_t esp0; + uint32_t ss0; + uint32_t esp1; + uint32_t ss2; + uint32_t cr3; + uint32_t eip; + uint32_t eflags; + uint32_t eax; + uint32_t ecx; + uint32_t edx; + uint32_t ebx; + uint32_t esp; + uint32_t ebp; + uint32_t esi; + uint32_t edi; + uint32_t es; + uint32_t cs; + uint32_t ss; + uint32_t ds; + uint32_t fs; + uint32_t gs; + uint32_t ldtr; + uint16_t trap; + uint16_t iomap_base; +} __attribute__((packed)); + +void gdt_set_gate(int num, uint32_t base, uint32_t limit, uint8_t access, uint8_t gran); +void write_tss(int num, uint32_t ss0, uint32_t esp0); +void set_kernel_esp(uint32_t esp); +void gdt_install(void); + +void flush_gdt(void); + +#endif -- cgit v1.2.3