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Redesign userspace memory management
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This commit is contained in:
Kamil Kowalczyk
2026-01-27 17:04:08 +01:00
parent 600886a7ee
commit b388b30b24
23 changed files with 195 additions and 484 deletions
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123
kernel/syscall/syscall.c
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@@ -5,7 +5,6 @@
#include <m/status.h>
#include <m/syscall_defs.h>
#include <mm/pmm.h>
#include <proc/mem.h>
#include <proc/mutex.h>
#include <proc/proc.h>
#include <proc/procgroup.h>
@@ -17,8 +16,11 @@
#include <syscall/syscall.h>
#define DEFINE_SYSCALL(name) \
int name (struct proc* UNUSED proc, void* UNUSED regs, uintptr_t UNUSED a1, uintptr_t UNUSED a2, \
uintptr_t UNUSED a3, uintptr_t UNUSED a4, uintptr_t UNUSED a5, uintptr_t UNUSED a6)
uintptr_t name (struct proc* UNUSED proc, void* UNUSED regs, uintptr_t UNUSED a1, \
uintptr_t UNUSED a2, uintptr_t UNUSED a3, uintptr_t UNUSED a4, \
uintptr_t UNUSED a5, uintptr_t UNUSED a6)
#define SYSRESULT(x) ((uintptr_t)(x))
static void* sys_get_user_buffer (struct proc* proc, uintptr_t uvaddr, size_t size) {
struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
@@ -43,46 +45,26 @@ static void* sys_get_user_buffer (struct proc* proc, uintptr_t uvaddr, size_t si
/* int quit (void) */
DEFINE_SYSCALL (sys_quit) {
proc_kill (proc);
return ST_OK;
return SYSRESULT (ST_OK);
}
/* int test (void) */
DEFINE_SYSCALL (sys_test) {
char c = (char)a1;
DEBUG ("test syscall from %d! %c\n", proc->pid, c);
return ST_OK;
return SYSRESULT (ST_OK);
}
/* int map (int mem_rid, uintptr_t vaddr, uint32_t flags) */
/* int map (uintptr_t vaddr, size_t pages, uint32_t flags) */
DEFINE_SYSCALL (sys_map) {
spin_lock_ctx_t ctxrs;
int mem_rid = (int)a1;
uintptr_t vaddr = a2;
uintptr_t vaddr = a1;
size_t pages = (size_t)a2;
uint32_t flags = (uint32_t)a3;
if (vaddr % PAGE_SIZE != 0)
return -ST_UNALIGNED;
return SYSRESULT (-ST_UNALIGNED);
struct proc_resource* mem_resource = proc_find_resource (proc->procgroup, mem_rid);
if (mem_resource == NULL) {
return -ST_NOT_FOUND;
}
spin_lock (&mem_resource->lock, &ctxrs);
if (mem_resource->type != PR_MEM) {
spin_unlock (&mem_resource->lock, &ctxrs);
return -ST_BAD_RESOURCE;
}
uintptr_t paddr = mem_resource->u.mem.paddr;
size_t pages = mem_resource->u.mem.pages;
spin_unlock (&mem_resource->lock, &ctxrs);
return proc_map (proc, paddr, vaddr, pages, flags) ? ST_OK : -ST_OOM_ERROR;
return SYSRESULT (procgroup_map (proc->procgroup, vaddr, pages, flags, NULL));
}
/* int unmap (uintptr_t vaddr, size_t pages) */
@@ -91,59 +73,9 @@ DEFINE_SYSCALL (sys_unmap) {
size_t pages = (size_t)a2;
if (vaddr % PAGE_SIZE != 0)
return -ST_UNALIGNED;
return SYSRESULT (-ST_UNALIGNED);
return proc_unmap (proc, vaddr, pages) ? ST_OK : -ST_OOM_ERROR;
}
/* int create_mem (int rid, size_t pages) */
DEFINE_SYSCALL (sys_create_mem) {
int rid = (int)a1;
size_t pages = (size_t)a2;
if (pages == 0)
return ST_OK;
/* int rid1 = rid < 0 ? atomic_fetch_add (&proc->resources->sys_rids, 1) : rid; */
int rid1 = rid < 0 ? procgroup_get_sys_rid (proc->procgroup) : rid;
struct proc_resource* mem_resource =
proc_create_resource_mem (proc->procgroup, rid1, pages, 0, false);
if (mem_resource == NULL)
return -ST_OOM_ERROR;
return mem_resource->rid;
}
/* int unlink_mem (int rid, size_t pages) */
DEFINE_SYSCALL (sys_unlink_mem) {
/* spin_lock_ctx_t ctxrs; */
/* int rid = (int)a1; */
/* size_t pages = (size_t)a2; */
/* if (!(vis == RV_PUBLIC || vis == RV_PRIVATE)) */
/* return -ST_BAD_RESOURCE; */
/* struct proc_resource* mem_resource = proc_find_resource (proc, rid, vis); */
/* if (mem_resource == NULL) */
/* return -ST_NOT_FOUND; */
/* spin_lock (&mem_resource->lock, &ctxrs); */
/* if (mem_resource->type != PR_MEM) { */
/* spin_unlock (&mem_resource->lock, &ctxrs); */
/* return -ST_BAD_RESOURCE; */
/* } */
/* mem_resource->u.mem.alive_pages -= pages; */
/* if (mem_resource->u.mem.alive_pages < 0) { */
/* spin_unlock (&mem_resource->lock, &ctxrs); */
/* proc_drop_resource (proc, mem_resource, true); */
/* } */
return ST_OK;
return SYSRESULT (procgroup_unmap (proc->procgroup, vaddr, pages));
}
/* int clone (uintptr_t vstack_top, size_t stack_size, void* entry) */
@@ -157,20 +89,20 @@ DEFINE_SYSCALL (sys_clone) {
DEBUG ("new=%p\n", new);
if (new == NULL) {
return -ST_OOM_ERROR;
return SYSRESULT (-ST_OOM_ERROR);
}
int pid = new->pid;
proc_register (new, NULL);
return pid;
return SYSRESULT (pid);
}
/* int sched (void) */
DEFINE_SYSCALL (sys_sched) {
proc_sched ();
return ST_OK;
return SYSRESULT (ST_OK);
}
/* int create_mutex (int mutex_rid) */
@@ -180,9 +112,9 @@ DEFINE_SYSCALL (sys_create_mutex) {
struct proc_resource* mutex_resource = proc_create_resource_mutex (proc->procgroup, mutex_rid);
if (mutex_resource == NULL)
return -ST_OOM_ERROR;
return SYSRESULT (-ST_OOM_ERROR);
return mutex_resource->rid;
return SYSRESULT (mutex_resource->rid);
}
/* int unlink_mutex (int mutex_rid) */
@@ -192,11 +124,9 @@ DEFINE_SYSCALL (sys_unlink_mutex) {
struct proc_resource* mutex_resource = proc_find_resource (proc->procgroup, mutex_rid);
if (mutex_resource == NULL)
return -ST_NOT_FOUND;
return SYSRESULT (-ST_NOT_FOUND);
/* proc_drop_resource (proc, mutex_resource, true); */
return ST_OK;
return SYSRESULT (ST_OK);
}
/* int lock_mutex (int mutex_rid) */
@@ -206,11 +136,11 @@ DEFINE_SYSCALL (sys_lock_mutex) {
struct proc_resource* mutex_resource = proc_find_resource (proc->procgroup, mutex_rid);
if (mutex_resource == NULL)
return -ST_NOT_FOUND;
return SYSRESULT (-ST_NOT_FOUND);
proc_mutex_lock (proc, &mutex_resource->u.mutex);
return ST_OK;
return SYSRESULT (ST_OK);
}
/* int unlock_mutex (int mutex_rid) */
@@ -220,9 +150,10 @@ DEFINE_SYSCALL (sys_unlock_mutex) {
struct proc_resource* mutex_resource = proc_find_resource (proc->procgroup, mutex_rid);
if (mutex_resource == NULL)
return -ST_NOT_FOUND;
return SYSRESULT (-ST_NOT_FOUND);
return proc_mutex_unlock (proc, &mutex_resource->u.mutex) ? ST_OK : -ST_PERMISSION_ERROR;
return SYSRESULT (proc_mutex_unlock (proc, &mutex_resource->u.mutex) ? ST_OK
: -ST_PERMISSION_ERROR);
}
static syscall_handler_func_t handler_table[] = {
@@ -232,8 +163,6 @@ static syscall_handler_func_t handler_table[] = {
[SYS_UNMAP] = &sys_unmap,
[SYS_CLONE] = &sys_clone,
[SYS_SCHED] = &sys_sched,
[SYS_CREATE_MEM] = &sys_create_mem,
[SYS_UNLINK_MEM] = &sys_unlink_mem,
[SYS_CREATE_MUTEX] = &sys_create_mutex,
[SYS_UNLINK_MUTEX] = &sys_unlink_mutex,
[SYS_LOCK_MUTEX] = &sys_lock_mutex,