diff options
| author | Danny Holman <dholman@gymli.xyz> | 2021-07-24 02:27:40 -0500 |
|---|---|---|
| committer | Danny Holman <dholman@gymli.xyz> | 2021-07-24 02:27:40 -0500 |
| commit | 7498b41d94b2f34468833b55ad0472d75b63064e (patch) | |
| tree | a16b9c728edd4116b401f7fd337cb36b8d33fd78 /arch/i386/include | |
| parent | d4003f1d6daf6883acb83a398e3fdba5336aefef (diff) | |
arch: i386: add GDT setup routines
Add a set of routines that setup the x86's global descriptor table.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
Diffstat (limited to 'arch/i386/include')
| -rw-r--r-- | arch/i386/include/gdt.h | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/arch/i386/include/gdt.h b/arch/i386/include/gdt.h deleted file mode 100644 index 4ffa155..0000000 --- a/arch/i386/include/gdt.h +++ /dev/null @@ -1,69 +0,0 @@ -#ifndef GDT_H -#define GDT_H - -#include <stdint.h> - -#define SEG_DESCTYPE(x) ((x) << 0x04) -#define SEG_PRES(x) ((x) << 0x07) -#define SEG_SAVL(x) ((x) << 0x0C) -#define SEG_LONG(x) ((x) << 0x0D) -#define SEG_SIZE(x) ((x) << 0x0E) -#define SEG_GRAN(x) ((x) << 0x0F) -#define SEG_PRIV(x) (((x) & 0x03) << 0x05) - -#define SEG_DATA_RD 0x00 -#define SEG_DATA_RDA 0x01 -#define SEG_DATA_RDWR 0x02 -#define SEG_DATA_RDWRA 0x03 -#define SEG_DATA_RDEXPD 0x04 -#define SEG_DATA_RDEXPDA 0x05 -#define SEG_DATA_RDWREXD 0x06 -#define SEG_DATA_RDWREXDA 0x07 -#define SEG_CODE_EX 0x08 -#define SEG_CODE_EXA 0x09 -#define SEG_CODE_EXRD 0x0A -#define SEG_CODE_EXRDA 0x0B -#define SEG_CODE_EXC 0x0C -#define SEG_CODE_EXCA 0x0D -#define SEG_CODE_EXRDC 0x0E -#define SEG_CODE_EXRDCA 0x0F - -#define GDT_CODE_PL0 SEG_DESCTYPE(1) | SEG_PRES(1) | SEG_SAVL(0) | \ - SEG_LONG(0) | SEG_SIZE(1) | SEG_GRAN(1) | \ - SEG_PRIV(0) | SEG_CODE_EXRD - -#define GDT_DATA_PL0 SEG_DESCTYPE(1) | SEG_PRES(1) | SEG_SAVL(0) | \ - SEG_LONG(0) | SEG_SIZE(1) | SEG_GRAN(1) | \ - SEG_PRIV(0) | SEG_CODE_RDWR - -#define GDT_CODE_PL3 SEG_DESCTYPE(1) | SEG_PRES(1) | SEG_SAVL(0) | \ - SEG_LONG(0) | SEG_SIZE(1) | SEG_GRAN(1) | \ - SEG_PRIV(3) | SEG_DATA_EXRD - -#define GDT_DATA_PL3 SEG_DESCTYPE(1) | SEG_PRES(1) | SEG_SAVL(0) | \ - SEG_LONG(0) | SEG_SIZE(1) | SEG_GRAN(1) | \ - SEG_PRIV(3) | SEG_DATA_RDWR - -struct gdt { - uint16_t size; - uint32_t offset; -} __attribute__((packed)); - -void flush_gdt(void); - -uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag) { - uint64_t descriptor; - - descriptor = limit & 0x000F0000; - descriptor |= (flag << 8) & 0x00F0FF00; - descriptor |= (base >> 16) & 0x000000FF; - descriptor |= base & 0xFF000000; - - descriptor <<= 32; - descriptor |= base << 16; - descriptor |= limit & 0x0000FFFF; - - return descriptor; -} - -#endif |