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working on reading elf from initrd, and getting it launched with the new scheduler

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slinky55
2026-06-30 19:26:31 -05:00
parent ce81d4eb31
commit af6c1c94cf
21 changed files with 253 additions and 151 deletions
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40
kernel/gdt.c
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@@ -1,4 +1,4 @@
#include <stdint.h>
#include <gdt.h>
#define SEG_DESCTYPE(x) ((x) << 0x04) // Descriptor type (0 for system, 1 for code/data)
#define SEG_PRES(x) ((x) << 0x07) // Present
@@ -45,41 +45,11 @@ typedef struct __attribute__((packed)) {
uint16_t limit;
uint32_t base;
} gdt_ptr_t;
typedef struct __attribute__((packed)) {
uint32_t prev_tss;
uint32_t esp0;
uint32_t ss0;
uint32_t esp1;
uint32_t ss1;
uint32_t esp2;
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 ldt;
uint16_t trap;
uint16_t iomap_base;
} tss_entry;
uint64_t gdt[6];
gdt_ptr_t gdtr;
tss_entry tss;
tss_entry_t tss;
extern void load_gdt();
extern void tss_flush();
@@ -126,14 +96,14 @@ void init_gdt() {
gdt[3] = create_descriptor(0, 0x000FFFFF, (GDT_CODE_PL3));
gdt[4] = create_descriptor(0, 0x000FFFFF, (GDT_DATA_PL3));
for (uint32_t i = 0; i < sizeof(tss_entry); i++) {
for (uint32_t i = 0; i < sizeof(tss_entry_t); i++) {
((char*)&tss)[i] = 0;
}
tss.ss0 = 0x10;
tss.iomap_base = sizeof(tss_entry);
tss.iomap_base = sizeof(tss_entry_t);
gdt[5] = create_tss_descriptor((uint32_t)&tss, sizeof(tss_entry) - 1);
gdt[5] = create_tss_descriptor((uint32_t)&tss, sizeof(tss_entry_t) - 1);
gdtr.limit = 6 * sizeof(uint64_t) - 1;
gdtr.base = (uint32_t)&gdt;