From f004c1ade8d617a82cea2fe249434cccb47a2358 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Tue, 19 Mar 2024 13:03:52 -0400
Subject: rename abi to sys. better memory allocation

---
 usr/syscall.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 81 insertions(+), 5 deletions(-)

(limited to 'usr/syscall.c')

diff --git a/usr/syscall.c b/usr/syscall.c
index 8680845..fbc5fe7 100644
--- a/usr/syscall.c
+++ b/usr/syscall.c
@@ -1,11 +1,28 @@
 #include "syscall.h"
-#include "tsk/tasking.h"
+#include "sys/errno.h"
+#include "sys/permission.h"
+#include "usr/tasking.h"
 #include "mem/memory.h"
 #include "io/log.h"
 
+#define ENSURE_ADDR(ptr) \
+    if(!mem_check_ptr(ptr)) { klogf("User passed bad address %#016X\n", ptr); return -EFAULT; }
+
+#define ENSURE_PERM(p) \
+    if(!(task_current->perm & p)) return -ENOPERM
+
+#define PD_FOR_LINEAR_ADDRESS(addr) current_page_directory; \
+    if(addr.tid == -1) addr.tid = task_current->id; \
+    if(addr.tid != task_current->id) { \
+        ENSURE_PERM(PERM_MEM_VIRT_PD); \
+        struct Task *task = task_get(addr.tid); \
+        if(task == NULL) return -EFAULT; \
+        pd = task->pd; \
+    }
+
 int _syscall_handler_log(struct syscall_log *req)
 {
-    if(!mem_check_ptr(req->message)) return -1;
+    ENSURE_ADDR(req->message);
     klogf("%s", req->message);
     return 0;
 }
@@ -15,14 +32,73 @@ intmax_t _syscall_handler_tid(syscall_t *req)
     return task_current->id;
 }
 
+int _syscall_handler_mem_phys_resv(struct syscall_mem_phys_range_op *req)
+{
+    ENSURE_PERM(PERM_MEM_PHYS_RESV);
+    mem_phys_reserve(req->base, req->limit);
+    return 0;
+}
+
+int _syscall_handler_mem_phys_free(struct syscall_mem_phys_range_op *req)
+{
+    ENSURE_PERM(PERM_MEM_PHYS_FREE);
+    mem_phys_release(req->base, req->limit);
+    return 0;
+}
+
+int _syscall_handler_mem_phys_alloc(struct syscall_mem_phys_alloc *req)
+{
+    ENSURE_ADDR(req->result);
+    ENSURE_PERM(PERM_MEM_PHYS_ALLOC);
+    *req->result = mem_phys_alloc(req->npages);
+    return 0;
+}
+
+int _syscall_handler_mem_virt_mapping(struct syscall_mem_virt_mapping *req)
+{
+    ENSURE_ADDR(req->result);
+    ENSURE_PERM(PERM_MEM_VIRT_MAP);
+    page_directory_t *pd = PD_FOR_LINEAR_ADDRESS(req->addr);
+    *req->result = mem_get_mapping_as(pd, req->addr.addr);
+    return 0;
+}
+
+int _syscall_handler_mem_virt_map(struct syscall_mem_virt_map *req)
+{
+    ENSURE_PERM(PERM_MEM_VIRT_MAP);
+    page_directory_t *pd = PD_FOR_LINEAR_ADDRESS(req->addr);
+    mem_set_mapping_as(pd, req->map, req->addr.addr);
+    return 0;
+}
+
+int _syscall_handler_mem_virt_alloc(struct syscall_mem_virt_alloc *req)
+{
+    ENSURE_PERM(PERM_MEM_VIRT_MAP);
+    ENSURE_PERM(PERM_MEM_PHYS_ALLOC);
+    page_directory_t *pd = PD_FOR_LINEAR_ADDRESS(req->from);
+    mem_ensure_range_as(pd, req->from.addr, req->to, req->flg);
+    return 0;
+}
+
 void *_syscall_handlers[SYSCALL_COUNT] = {
-    _syscall_handler_log
+    _syscall_handler_log,
+    _syscall_handler_tid,
+
+    _syscall_handler_mem_phys_resv,
+    _syscall_handler_mem_phys_free,
+    _syscall_handler_mem_phys_alloc,
+
+    _syscall_handler_mem_virt_mapping,
+    _syscall_handler_mem_virt_map,
+    _syscall_handler_mem_virt_alloc,
 };
 
 int
 syscall_handler(syscall_t *req)
 {
-    if(!mem_check_ptr(req)) return -1;
-    if(req->id >= SYSCALL_COUNT) return -1;
+    ENSURE_ADDR(req);
+    if(req->id >= SYSCALL_COUNT) return -ENOSYS;
+
+    ENSURE_ADDR(_syscall_handlers[req->id]);
     return ((syscall_handler_t)(_syscall_handlers[req->id]))(req);
 }
-- 
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