refactor: one more step towards arch-agnostic design

[lunaix-os.git] / lunaix-os / arch / i386 / pfault.c

diff --git a/lunaix-os/arch/i386/pfault.c b/lunaix-os/arch/i386/pfault.c
deleted file mode 100644 (file)
index 58c7ec2..0000000
--- a/lunaix-os/arch/i386/pfault.c
+++ /dev/null
@@ -1,170 +0,0 @@
-#include <sys/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/signal.h>
-#include <lunaix/status.h>
-#include <lunaix/syslog.h>
-
-#include <klibc/string.h>
-
-static u32_t
-get_ptattr(struct mm_region* vmr)
-{
-    u32_t vmr_attr = vmr->attr;
-    u32_t ptattr = PG_PRESENT | PG_ALLOW_USER;
-
-    if ((vmr_attr & PROT_WRITE)) {
-        ptattr |= PG_WRITE;
-    }
-
-    return ptattr & 0xfff;
-}
-
-static void
-kprintf(const char* fmt, ...)
-{
-    va_list args;
-    va_start(args, fmt);
-    __kprintf("PFAULT", fmt, args);
-    va_end(args);
-}
-
-#define COW_MASK (REGION_RSHARED | REGION_READ | REGION_WRITE)
-
-extern void
-__print_panic_msg(const char* msg, const isr_param* param);
-
-void
-intr_routine_page_fault(const isr_param* param)
-{
-    uint32_t errcode = param->execp->err_code;
-    ptr_t ptr = cpu_ldeaddr();
-    if (!ptr) {
-        goto segv_term;
-    }
-
-    v_mapping mapping;
-    if (!vmm_lookup(ptr, &mapping)) {
-        goto segv_term;
-    }
-
-    // XXX do kernel trigger pfault?
-
-    vm_regions_t* vmr = (vm_regions_t*)&__current->mm.regions;
-    struct mm_region* hit_region = region_get(vmr, ptr);
-
-    if (!hit_region) {
-        // 当你凝视深渊时……
-        goto segv_term;
-    }
-
-    volatile x86_pte_t* pte = &PTE_MOUNTED(VMS_SELF, ptr >> 12);
-    if (PG_IS_PRESENT(*pte)) {
-        if (((errcode ^ mapping.flags) & PG_ALLOW_USER)) {
-            // invalid access
-            kprintf(KDEBUG "invalid user access. (%p->%p, attr:0x%x)\n",
-                    mapping.va,
-                    mapping.pa,
-                    mapping.flags);
-            goto segv_term;
-        }
-        if ((hit_region->attr & COW_MASK) == COW_MASK) {
-            // normal page fault, do COW
-            cpu_flush_page((ptr_t)pte);
-
-            ptr_t pa = (ptr_t)vmm_dup_page(__current->pid, PG_ENTRY_ADDR(*pte));
-
-            pmm_free_page(__current->pid, *pte & ~0xFFF);
-            *pte = (*pte & 0xFFF & ~PG_DIRTY) | pa | PG_WRITE;
-
-            goto resolved;
-        }
-        // impossible cases or accessing privileged page
-        goto segv_term;
-    }
-
-    // an anonymous page and not present
-    //   -> a new page need to be alloc
-    if ((hit_region->attr & REGION_ANON)) {
-        if (!PG_IS_PRESENT(*pte)) {
-            cpu_flush_page((ptr_t)pte);
-
-            ptr_t pa = pmm_alloc_page(__current->pid, 0);
-            if (!pa) {
-                goto oom;
-            }
-
-            *pte = *pte | pa | get_ptattr(hit_region);
-            memset((void*)PG_ALIGN(ptr), 0, PG_SIZE);
-            goto resolved;
-        }
-        // permission denied on anon page (e.g., write on readonly page)
-        goto segv_term;
-    }
-
-    // if mfile is set (Non-anonymous), then it is a mem map
-    if (hit_region->mfile && !PG_IS_PRESENT(*pte)) {
-        struct v_file* file = hit_region->mfile;
-
-        ptr = PG_ALIGN(ptr);
-
-        u32_t mseg_off = (ptr - hit_region->start);
-        u32_t mfile_off = mseg_off + hit_region->foff;
-        ptr_t pa = pmm_alloc_page(__current->pid, 0);
-
-        if (!pa) {
-            goto oom;
-        }
-
-        cpu_flush_page((ptr_t)pte);
-        *pte = (*pte & 0xFFF) | pa | get_ptattr(hit_region);
-
-        memset((void*)ptr, 0, PG_SIZE);
-
-        int errno = 0;
-        if (mseg_off < hit_region->flen) {
-            errno =
-              file->ops->read_page(file->inode, (void*)ptr, PG_SIZE, mfile_off);
-        }
-
-        if (errno < 0) {
-            kprintf(KERROR "fail to populate page (%d)\n", errno);
-            goto segv_term;
-        }
-
-        *pte &= ~PG_DIRTY;
-
-        goto resolved;
-    }
-
-    // page not present, might be a chance to introduce swap file?
-    __print_panic_msg("WIP page fault route", param);
-    while (1)
-        ;
-
-oom:
-    kprintf(KERROR "out of memory\n");
-
-segv_term:
-    kprintf(KERROR "(pid: %d) Segmentation fault on %p (%p:%p,e=0x%x)\n",
-            __current->pid,
-            ptr,
-            param->execp->cs,
-            param->execp->eip,
-            param->execp->err_code);
-
-    sigset_add(__current->sigctx.sig_pending, _SIGSEGV);
-
-    schedule();
-    // should not reach
-    while (1)
-        ;
-
-resolved:
-    cpu_flush_page(ptr);
-    return;
-}
\ No newline at end of file