refactor: decouple i386 specific instruction invocation

[lunaix-os.git] / lunaix-os / kernel / asm / x86 / pfault.c

diff --git a/lunaix-os/kernel/asm/x86/pfault.c b/lunaix-os/kernel/asm/x86/pfault.c
deleted file mode 100644 (file)
index 34589cb..0000000
--- a/lunaix-os/kernel/asm/x86/pfault.c
+++ /dev/null
@@ -1,111 +0,0 @@
-#include <arch/x86/interrupts.h>
-#include <lunaix/common.h>
-#include <lunaix/mm/mm.h>
-#include <lunaix/mm/pmm.h>
-#include <lunaix/mm/region.h>
-#include <lunaix/mm/vmm.h>
-#include <lunaix/sched.h>
-#include <lunaix/status.h>
-#include <lunaix/syslog.h>
-
-static void
-kprintf(const char* fmt, ...)
-{
-    va_list args;
-    va_start(args, fmt);
-    __kprintf("PFAULT", fmt, args);
-    va_end(args);
-}
-
-extern void
-__print_panic_msg(const char* msg, const isr_param* param);
-
-void
-intr_routine_page_fault(const isr_param* param)
-{
-    uintptr_t ptr = cpu_rcr2();
-    if (!ptr) {
-        goto segv_term;
-    }
-
-    v_mapping mapping;
-    if (!vmm_lookup(ptr, &mapping)) {
-        goto segv_term;
-    }
-
-    if (!SEL_RPL(param->cs)) {
-        // 如果是内核页错误……
-        if (do_kernel(&mapping)) {
-            return;
-        }
-        goto segv_term;
-    }
-
-    struct mm_region* hit_region = region_get(&__current->mm.regions, ptr);
-
-    if (!hit_region) {
-        // Into the void...
-        goto segv_term;
-    }
-
-    x86_pte_t* pte = PTE_MOUNTED(PD_REFERENCED, ptr >> 12);
-    if (*pte & PG_PRESENT) {
-        if ((hit_region->attr & REGION_PERM_MASK) ==
-            (REGION_RSHARED | REGION_READ)) {
-            // normal page fault, do COW
-            cpu_invplg(pte);
-            uintptr_t pa =
-              (uintptr_t)vmm_dup_page(__current->pid, PG_ENTRY_ADDR(*pte));
-            pmm_free_page(__current->pid, *pte & ~0xFFF);
-            *pte = (*pte & 0xFFF) | pa | PG_WRITE;
-            return;
-        }
-        // impossible cases or accessing privileged page
-        goto segv_term;
-    }
-
-    if (!(*pte)) {
-        // Invalid location
-        goto segv_term;
-    }
-    uintptr_t loc = *pte & ~0xfff;
-    // a writable page, not present, pte attr is not null
-    //   and no indication of cached page -> a new page need to be alloc
-    if ((hit_region->attr & REGION_WRITE) && (*pte & 0xfff) && !loc) {
-        cpu_invplg(pte);
-        uintptr_t pa = pmm_alloc_page(__current->pid, 0);
-        *pte = *pte | pa | PG_PRESENT;
-        return;
-    }
-    // page not present, bring it from disk or somewhere else
-    __print_panic_msg("WIP page fault route", param);
-    while (1)
-        ;
-
-segv_term:
-    kprintf(KERROR "(pid: %d) Segmentation fault on %p (%p:%p)\n",
-            __current->pid,
-            ptr,
-            param->cs,
-            param->eip);
-    terminate_proc(LXSEGFAULT);
-    // should not reach
-}
-
-int
-do_kernel(v_mapping* mapping)
-{
-    uintptr_t addr = mapping->va;
-    if (addr >= KHEAP_START && addr < PROC_START) {
-        // This is kernel heap page
-        uintptr_t pa = pmm_alloc_page(KERNEL_PID, 0);
-        *mapping->pte = (*mapping->pte & 0xfff) | pa | PG_PRESENT;
-        cpu_invplg(mapping->pte);
-        cpu_invplg(addr);
-        goto done;
-    }
-
-    return 0;
-done:
-    return 1;
-}
\ No newline at end of file