127 lines
3.9 KiB
C
127 lines
3.9 KiB
C
// SPDX-License-Identifier: MPL-2.0
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#ifndef SH_LIB_GDT_H
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#define SH_LIB_GDT_H
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#include "std/status.h"
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#include "std/type.h"
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#include "irq/tss.h"
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// Long mode GDT part
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// GDT entry 64 bits structure
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#pragma pack(1)
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typedef struct {
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sh_uint16 limit_low;
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sh_uint16 base_low;
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sh_uint8 base_mid;
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sh_uint8 access;
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sh_uint8 flags_limit_high;
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sh_uint8 base_high;
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} sh_gdt_GDT_ENTRY_64;
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#pragma pack()
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// GDT entry 128 bits (special TSS) structure
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#pragma pack(1)
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typedef struct {
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sh_uint16 limit_low;
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sh_uint16 base_low;
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sh_uint8 base_mid;
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sh_uint8 access;
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sh_uint8 flags_limit_high;
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sh_uint8 base_high;
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sh_uint32 base_upper;
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sh_uint32 reserved;
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} sh_gdt_GDT_ENTRY_128;
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#pragma pack()
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// GDTR structure
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#pragma pack(1)
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typedef struct {
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sh_uint16 limit;
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sh_uint64 base;
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} sh_gdt_GDTR;
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#pragma pack()
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// GDT structure for bootstrap core
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#pragma pack(1)
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typedef struct {
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sh_gdt_GDT_ENTRY_64 null;
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sh_gdt_GDT_ENTRY_64 kernel_code;
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sh_gdt_GDT_ENTRY_64 kernel_data;
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sh_gdt_GDT_ENTRY_64 user_code;
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sh_gdt_GDT_ENTRY_64 user_data;
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sh_gdt_GDT_ENTRY_128 tss;
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} sh_gdt_GDT;
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#pragma pack()
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// GDT structure for all APs
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#pragma pack(1)
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typedef struct {
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sh_gdt_GDT_ENTRY_64 null;
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sh_gdt_GDT_ENTRY_64 kernel_code;
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sh_gdt_GDT_ENTRY_64 kernel_data;
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sh_gdt_GDT_ENTRY_64 user_code;
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sh_gdt_GDT_ENTRY_64 user_data;
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sh_gdt_GDT_ENTRY_128 tss[256];
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} sh_gdt_GDT_AP;
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#pragma pack()
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// Generate access byte
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inline sh_uint8 sh_gdt_fill_access_byte(sh_bool present,sh_uint8 dpl,sh_bool descriptor_type,sh_uint8 segment_type) {
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return ((present?1:0)<<7)|((dpl&0x3)<<5)|((descriptor_type?1:0)<<4)|(segment_type&0xF);
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}
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// Generate flags byte (put all 4 bits in bit 0-3 of the returned byte)
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inline sh_uint8 sh_gdt_fill_flags_byte(sh_bool g,sh_bool db,sh_bool l,sh_bool avl) {
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return ((g?1:0)<<3)|((db?1:0)<<2)|((l?1:0)<<1)|((avl?1:0)<<0);
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}
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// Fill GDT entry 64 bits, expect flags as sh_gdt_fill_flags_byte would return it
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sh_gdt_GDT_ENTRY_64 sh_gdt_fill_gdt_entry_64(sh_uint32 limit,sh_uint32 base,sh_uint8 access,sh_uint8 flags);
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// Fill GDT entry 128 bits, expect flags as sh_gdt_fill_flags_byte would return it
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sh_gdt_GDT_ENTRY_128 sh_gdt_fill_gdt_entry_128(sh_uint32 limit,sh_uint64 base,sh_uint8 access,sh_uint8 flags);
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// Fill GDT with provided TSS
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SH_STATUS sh_gdt_fill_gdt(sh_tss_TSS *tss,sh_gdt_GDT *gdt);
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// Fill APs common GDT with provided TSS array
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SH_STATUS sh_gdt_fill_gdt_ap(sh_tss_TSS *tss,sh_uint64 tss_count,sh_gdt_GDT_AP *gdt);
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// Generate GDTR for AP GDT
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sh_gdt_GDTR sh_gdt_make_gdtr_ap(sh_gdt_GDT_AP *gdt);
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// Fill and load GDTR
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SH_STATUS sh_gdt_load_gdtr(sh_gdt_GDT *gdt);
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// Reload registers
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SH_STATUS sh_gdt_reload_registers();
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// 16/32 bits mode GDT part
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// GDT entry 32 bits structure
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#pragma pack(1)
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typedef struct {
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sh_uint16 limit_low;
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sh_uint16 base_low;
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sh_uint8 base_middle;
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sh_uint8 access;
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sh_uint8 granularity;
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sh_uint8 base_high;
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} sh_gdt_GDT_ENTRY_32;
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#pragma pack()
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// GDT 32 bits structure
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#pragma pack(1)
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typedef struct {
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sh_gdt_GDT_ENTRY_32 null;
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sh_gdt_GDT_ENTRY_32 code_64;
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sh_gdt_GDT_ENTRY_32 code;
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sh_gdt_GDT_ENTRY_32 data;
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} sh_gdt_GDT_32;
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#pragma pack()
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// Generate access byte
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inline sh_uint8 sh_gdt_fill_access_byte_32(sh_bool present,sh_uint8 dpl,sh_bool descriptor_type,sh_uint8 segment_type) {
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sh_uint8 access=0;
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access|=(present?1:0)<<7;
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access|=(dpl&0x3)<<5;
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access|=(descriptor_type?1:0)<<4;
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access|=(segment_type&0xF);
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return access;
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}
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// Generate granularity byte
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inline sh_uint8 sh_gdt_fill_granularity_byte_32(sh_bool granularity,sh_bool db,sh_bool l,sh_bool avl) {
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sh_uint8 g=0;
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g|=(granularity?1:0)<<7;
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g|=(db?1:0)<<6;
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g|=(l?1:0)<<5;
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g|=(avl?1:0)<<4;
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return g;
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}
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// Fill GDT entry 32 bits, expect granularity as sh_gdt_fill_granularity_byte_32 would return it
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sh_gdt_GDT_ENTRY_32 sh_gdt_fill_gdt_entry_32(sh_uint32 limit,sh_uint32 base,sh_uint8 access,sh_uint8 granularity);
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// Fill GDT 32 bits
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SH_STATUS sh_gdt_fill_gdt_32(sh_gdt_GDT_32 *gdt_32);
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#endif
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