PROJECT RESTRUCTURING

Move the entire kernel into its own directory. Create new directories
for system commands, libraries and other required essentials for a
complete Unix-like operating system.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 0 insertions, 130 deletions

diff --git a/arch/i386/kernel/paging.c b/arch/i386/kernel/paging.c
deleted file mode 100644
index a0bbb92..0000000
--- a/arch/i386/kernel/paging.c
+++ /dev/null
@@ -1,130 +0,0 @@
-#include <kernel/paging.h>
-#include <kernel/asm.h>
-#include <kernel/vmem.h>
-#include <kernel/pmem.h>
-#include <kernel/panic.h>
-#include <kernel/syscall.h>
-#include <libk/io.h>
-#include <libk/string.h>
-
-static int paging_enabled = 0;
-
-void paging_init(void) {
-        if (paging_enabled == 1)
-                return;
-
-        uintptr_t phys_pt = pfa_alloc(1);
-        map_page(phys_pt, PAGE_TMP_MAP, PD_PRES | PD_RW);
-        uintptr_t *pt = (uintptr_t*)PAGE_TMP_MAP;
-        for (uintptr_t i = KSTART; i < KEND; i += PAGE_SIZE)
-                pt[GET_PTX(GET_VADDR(i))] = i | PD_PRES;
-        unmap_page(PAGE_TMP_MAP);
-
-        uintptr_t temp_pt = pfa_alloc(1);
-
-        uintptr_t phys_pd = pfa_alloc(1);
-        map_page(phys_pd, PAGE_TMP_MAP, PD_PRES | PD_RW);
-        uintptr_t *pd = (uintptr_t*)PAGE_TMP_MAP;
-        pd[GET_PDX(GET_VADDR(KSTART))] = phys_pt | PD_PRES | PD_RW;
-        pd[GET_PDX(PAGE_TMP_MAP)] = temp_pt | PD_PRES | PD_RW;
-        pd[1023] = phys_pd | PD_PRES | PD_RW;
-        unmap_page(PAGE_TMP_MAP);
-
-        enable_paging(phys_pd);
-        paging_enabled = 1;
-        return;
-}
-
-void init_page_table(int pdindex, uint32_t flags) {
-        uintptr_t *pd = (uintptr_t*)PAGE_DIR_MAP;
-        if ((pd[pdindex] & PD_PRES) != 0)
-                return;
-
-        uintptr_t paddr = pfa_alloc(1);
-        pd[pdindex] = paddr | PD_PRES | PD_RW | flags;
-        
-        uintptr_t *pt = ((uintptr_t*)PAGE_TAB_MAP) + (pdindex << 12);
-        pd[GET_PDX(pt)] = paddr | PD_PRES | PD_RW;
-}
-
-uintptr_t init_page_directory(void) {
-        uintptr_t ret = pfa_alloc(1);
-        map_page(ret, PAGE_TMP_MAP, PD_RW);
-
-        uintptr_t *new_pd = (uintptr_t*)PAGE_TMP_MAP;
-        uintptr_t *cur_pd = (uintptr_t*)PAGE_DIR_MAP;
-        int kernel_pdx = GET_PDX(GET_VADDR(KSTART));
-        new_pd[kernel_pdx] = cur_pd[kernel_pdx];
-
-        unmap_page(PAGE_TMP_MAP);
-        return ret;
-}
-
-void map_page(uintptr_t paddr, uintptr_t vaddr, uint32_t flags) {
-        paddr = PGROUNDDN(paddr);
-        vaddr = PGROUNDDN(vaddr);
-
-        int pdindex = GET_PDX(vaddr);
-        int ptindex = GET_PTX(vaddr);
-
-        uintptr_t *pd = (uintptr_t*)PAGE_DIR_MAP;
-        if ((pd[pdindex] & PD_PRES) == 0)
-                init_page_table(pdindex, 0);
-
-        uintptr_t *pt = (uintptr_t*)(PAGE_TAB_MAP + (pdindex << 12));
-        pt[ptindex] = paddr | PD_PRES | flags;
-        invlpg((void*)vaddr);
-}
-
-void unmap_page(uintptr_t vaddr) {
-        uintptr_t pdindex = GET_PDX(vaddr);
-        uintptr_t ptindex = GET_PTX(vaddr);
-
-        uintptr_t *pd = (uintptr_t*)PAGE_DIR_MAP;
-        if ((pd[pdindex] & PD_PRES) == 0)
-                return;
-
-        uintptr_t *pt = (uintptr_t*)(PAGE_TAB_MAP + (pdindex << 12));
-        pt[ptindex] = 0;
-        invlpg((void*)vaddr);
-}
-
-void page_fault_handler(struct isr_frame *frame) {
-        uintptr_t fault_addr;
-        __asm__ volatile("movl %%cr2, %0" : "=r"(fault_addr));
-
-        kprintf("Faulting address: %x\n", fault_addr);
-        panic("Page fault not operational");
-        switch (frame->isr_err) {
-                case 0:
-                        //map_page((uintptr_t*)GET_VADDR(frame->cr3), pfa_alloc(), fault_addr, PD_PRES);
-                        break;
-                case 1:
-                        panic("Kernel process caused protection fault on read\n");
-                        break;
-                case 2:
-                        //map_page((uintptr_t*)GET_VADDR(frame->cr3), pfa_alloc(), fault_addr, PD_PRES | PD_RW);
-                        break;
-                case 3:
-                        panic("Kernel process caused protection fault on write\n");
-                        break;
-                case 4:
-                        //map_page((uintptr_t*)GET_VADDR(frame->cr3), pfa_alloc(), fault_addr, PD_PRES | PD_USR);
-                        break;
-                case 5:
-                        // TODO: instead of panicking, kill process
-                        panic("User process caused protection fault on read\n");
-                        break;
-                case 6:
-                        //map_page((uintptr_t*)GET_VADDR(frame->cr3), pfa_alloc(), fault_addr, PD_PRES | PD_RW | PD_USR);
-                        break;
-                case 7:
-                        // TODO: see case 101
-                        panic("USER process caused protection fault on write\n");
-                        break;
-                default:
-                        kprintf("Unknown paging error occured on address %x\n", fault_addr);
-                        panic("Paging error");
-                        break;
-        }
-}