core: added the shell structure
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parent
5fc5a3be0e
commit
232b19666a
105
src/gdt/gdt.c
105
src/gdt/gdt.c
@ -6,27 +6,28 @@ extern void setGdt(void *);
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void encodeGdtEntry(uint8_t *target, struct gdt_entry source)
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{
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// Check the limit to make sure that it can be encoded
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if (source.limit > 0xFFFFF) {
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kprintf(KERN_ERR, "GDT cannot encode limits larger than 0xFFFFF");
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}
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// Check the limit to make sure that it can be encoded
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if (source.limit > 0xFFFFF) {
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kprintf(KERN_ERR,
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"GDT cannot encode limits larger than 0xFFFFF");
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}
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// Encode the limit
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target[0] = source.limit & 0xFF;
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target[1] = (source.limit >> 8) & 0xFF;
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target[6] = (source.limit >> 16) & 0x0F;
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// Encode the limit
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target[0] = source.limit & 0xFF;
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target[1] = (source.limit >> 8) & 0xFF;
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target[6] = (source.limit >> 16) & 0x0F;
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// Encode the base
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target[2] = source.base & 0xFF;
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target[3] = (source.base >> 8) & 0xFF;
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target[4] = (source.base >> 16) & 0xFF;
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target[7] = (source.base >> 24) & 0xFF;
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// Encode the base
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target[2] = source.base & 0xFF;
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target[3] = (source.base >> 8) & 0xFF;
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target[4] = (source.base >> 16) & 0xFF;
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target[7] = (source.base >> 24) & 0xFF;
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// Encode the access byte
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target[5] = source.access_byte;
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// Encode the access byte
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target[5] = source.access_byte;
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// Encode the flags
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target[6] |= (source.flags << 4);
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// Encode the flags
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target[6] |= (source.flags << 4);
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}
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uint8_t gdt_entries[8][7];
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@ -34,58 +35,44 @@ struct gdt_descriptor gdtr;
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void initGdt()
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{
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gdtr.size = GDT_SIZE - 1;
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gdtr.base = GDT_BASE;
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gdtr.size = GDT_SIZE - 1;
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gdtr.base = GDT_BASE;
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struct gdt_entry gdt_entry_null_descriptor = { .base = 0,
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.limit = 0x00000000,
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.access_byte = 0x00,
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.flags = 0x0};
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encodeGdtEntry(gdt_entries[0], gdt_entry_null_descriptor);
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struct gdt_entry gdt_entry_null_descriptor = {
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.base = 0, .limit = 0x00000000, .access_byte = 0x00, .flags = 0x0};
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encodeGdtEntry(gdt_entries[0], gdt_entry_null_descriptor);
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struct gdt_entry gdt_entry_kernel_mode_code_segment = { .base = 0,
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.limit = 0xFFFFF,
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.access_byte = 0x9A,
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.flags = 0xC };
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encodeGdtEntry(gdt_entries[1], gdt_entry_kernel_mode_code_segment);
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struct gdt_entry gdt_entry_kernel_mode_code_segment = {
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.base = 0, .limit = 0xFFFFF, .access_byte = 0x9A, .flags = 0xC};
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encodeGdtEntry(gdt_entries[1], gdt_entry_kernel_mode_code_segment);
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struct gdt_entry gdt_entry_kernel_mode_data_segment = { .base = 0,
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.limit = 0xFFFFF,
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.access_byte = 0x92,
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.flags = 0xC };
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encodeGdtEntry(gdt_entries[2], gdt_entry_kernel_mode_data_segment);
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struct gdt_entry gdt_entry_kernel_mode_data_segment = {
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.base = 0, .limit = 0xFFFFF, .access_byte = 0x92, .flags = 0xC};
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encodeGdtEntry(gdt_entries[2], gdt_entry_kernel_mode_data_segment);
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struct gdt_entry gdt_entry_kernel_mode_stack_segment = { .base = 0x0,
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.limit = 0x0,
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.access_byte = 0x97,
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.flags = 0x0D };
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encodeGdtEntry(gdt_entries[3], gdt_entry_kernel_mode_data_segment);
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struct gdt_entry gdt_entry_kernel_mode_stack_segment = {
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.base = 0x0, .limit = 0x0, .access_byte = 0x97, .flags = 0x0D};
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encodeGdtEntry(gdt_entries[3], gdt_entry_kernel_mode_data_segment);
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struct gdt_entry gdt_entry_user_mode_code_segment = { .base = 0,
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.limit = 0xFFFFF,
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.access_byte = 0xFA,
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.flags = 0xC };
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encodeGdtEntry(gdt_entries[4], gdt_entry_user_mode_code_segment);
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struct gdt_entry gdt_entry_user_mode_code_segment = {
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.base = 0, .limit = 0xFFFFF, .access_byte = 0xFA, .flags = 0xC};
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encodeGdtEntry(gdt_entries[4], gdt_entry_user_mode_code_segment);
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struct gdt_entry gdt_entry_user_mode_data_segment = { .base = 0,
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.limit = 0xFFFFF,
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.access_byte = 0xF2,
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.flags = 0xC };
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encodeGdtEntry(gdt_entries[5], gdt_entry_user_mode_data_segment);
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struct gdt_entry gdt_entry_user_mode_data_segment = {
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.base = 0, .limit = 0xFFFFF, .access_byte = 0xF2, .flags = 0xC};
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encodeGdtEntry(gdt_entries[5], gdt_entry_user_mode_data_segment);
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struct gdt_entry gdt_entry_user_mode_stack_segment = { .base = 0x0,
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.limit = 0x0,
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.access_byte = 0xF7,
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.flags = 0x0D };
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encodeGdtEntry(gdt_entries[6], gdt_entry_user_mode_data_segment);
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struct gdt_entry gdt_entry_user_mode_stack_segment = {
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.base = 0x0, .limit = 0x0, .access_byte = 0xF7, .flags = 0x0D};
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encodeGdtEntry(gdt_entries[6], gdt_entry_user_mode_data_segment);
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memcpy((void *) gdtr.base, (void *) gdt_entries, (size_t) GDT_SIZE);
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memcpy((void *)gdtr.base, (void *)gdt_entries, (size_t)GDT_SIZE);
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/* load the gdtr registry */
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asm("lgdtl (gdtr)");
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/* load the gdtr registry */
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asm("lgdtl (gdtr)");
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/* initiliaz the segments */
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asm(" movw $0x10, %ax \n \
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/* initiliaz the segments */
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asm(" movw $0x10, %ax \n \
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movw %ax, %ds \n \
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movw %ax, %es \n \
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movw %ax, %fs \n \
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0
src/shell/color.c
Normal file
0
src/shell/color.c
Normal file
0
src/shell/echo.c
Normal file
0
src/shell/echo.c
Normal file
0
src/shell/exec.c
Normal file
0
src/shell/exec.c
Normal file
0
src/shell/poweroff.c
Normal file
0
src/shell/poweroff.c
Normal file
0
src/shell/reboot.c
Normal file
0
src/shell/reboot.c
Normal file
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