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x86_64: add pmap_handle_fault to route user-mode page faults to vm-region to resolve

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This commit is contained in:
max 🍓
2026-02-08 13:03:28 +00:00
parent 883b5ac9e2
commit 67b3be9732
1 changed files with 65 additions and 1 deletions
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66
arch/x86_64/pmap.c
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@@ -1,9 +1,13 @@
#include <mango/compiler.h>
#include <mango/libc/stdio.h>
#include <mango/memblock.h>
#include <mango/pmap.h>
#include <mango/printk.h>
#include <mango/sched.h>
#include <mango/status.h>
#include <mango/types.h>
#include <mango/vm-object.h>
#include <mango/vm-region.h>
#include <mango/vm.h>
/* some helpful datasize constants */
@@ -296,13 +300,73 @@ void pmap_bootstrap(void)
pmap_t pmap_create(void)
{
return 0;
pmap_t pmap = alloc_pmap();
pmap_t kernel_pmap = get_kernel_pmap();
struct pml4t *pml4t = vm_phys_to_virt(pmap);
struct pml4t *kernel_pml4t = vm_phys_to_virt(kernel_pmap);
for (unsigned int i = 256; i < 512; i++) {
pml4t->p_entries[i] = kernel_pml4t->p_entries[i];
}
return pmap;
}
void pmap_destroy(pmap_t pmap)
{
}
static void log_fault(virt_addr_t fault_addr, enum pmap_fault_flags flags)
{
char flag_str[128] = {0};
size_t p = 0;
if (flags & PMAP_FAULT_PRESENT) {
p += snprintf(flag_str + p, sizeof flag_str - p, " PRESENT");
} else {
p += snprintf(flag_str + p, sizeof flag_str - p, " MISSING");
}
if (flags & PMAP_FAULT_USER) {
p += snprintf(flag_str + p, sizeof flag_str - p, " USER");
} else {
p += snprintf(flag_str + p, sizeof flag_str - p, " SVR");
}
if (flags & PMAP_FAULT_WRITE) {
p += snprintf(flag_str + p, sizeof flag_str - p, " WRITE");
} else {
p += snprintf(flag_str + p, sizeof flag_str - p, " READ");
}
if (flags & PMAP_FAULT_IFETCH) {
p += snprintf(flag_str + p, sizeof flag_str - p, " IFETCH");
}
if (flags & PMAP_FAULT_BADCFG) {
p += snprintf(flag_str + p, sizeof flag_str - p, " BADCFG");
}
printk("pmap: fault at 0x%llx (%s)", fault_addr, flag_str);
}
kern_status_t pmap_handle_fault(
virt_addr_t fault_addr,
enum pmap_fault_flags flags)
{
// log_fault(fault_addr, flags);
if (flags & PMAP_FAULT_PRESENT) {
return KERN_FATAL_ERROR;
}
struct task *task = current_task();
struct vm_region *space = task->t_address_space;
return vm_region_demand_map(space, fault_addr, flags);
}
kern_status_t pmap_add(
pmap_t pmap,
virt_addr_t p,