From 59e3f74a2e1a0806350e1ffd77a528821d1f2be3 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Fri, 26 Apr 2024 16:06:35 +0200
Subject: Kernel: More out of memory condition checks

---
 kernel/drivers/ahci.c | 8 ++++++--
 kernel/drivers/ahci.h | 2 +-
 kernel/drivers/vbe.c  | 6 +++++-
 kernel/drivers/vbe.h  | 2 +-
 4 files changed, 13 insertions(+), 5 deletions(-)

(limited to 'kernel/drivers')

diff --git a/kernel/drivers/ahci.c b/kernel/drivers/ahci.c
index f655709..1fad0a3 100644
--- a/kernel/drivers/ahci.c
+++ b/kernel/drivers/ahci.c
@@ -496,10 +496,10 @@ void add_devfs_drive_file(u8 port) {
   inode->inode_num = port;
 }
 
-void ahci_init(void) {
+int ahci_init(void) {
   struct PCI_DEVICE device;
   if (!pci_devices_by_id(0x01, 0x06, &device)) {
-    return;
+    return 0;
   }
   kprintf("vendor: %x\n", device.vendor);
   kprintf("device: %x\n", device.device);
@@ -509,6 +509,9 @@ void ahci_init(void) {
   pci_get_bar(&device, 5, &bar);
 
   u8 *HBA_base = mmu_map_frames((void *)bar.address, bar.size);
+  if (!HBA_base) {
+    return 0;
+  }
   hba = (volatile struct HBA_MEM *)(HBA_base);
   for (u8 i = 0; i < 32; i++) {
     if (!((hba->pi >> i) & 1)) {
@@ -535,4 +538,5 @@ void ahci_init(void) {
       break;
     }
   }
+  return 1;
 }
diff --git a/kernel/drivers/ahci.h b/kernel/drivers/ahci.h
index d075f07..6ec9a97 100644
--- a/kernel/drivers/ahci.h
+++ b/kernel/drivers/ahci.h
@@ -1 +1 @@
-void ahci_init(void);
+int ahci_init(void);
diff --git a/kernel/drivers/vbe.c b/kernel/drivers/vbe.c
index 9c6fa4a..e67a3d9 100644
--- a/kernel/drivers/vbe.c
+++ b/kernel/drivers/vbe.c
@@ -24,7 +24,7 @@ struct DISPLAY_INFO {
 
 struct DISPLAY_INFO vbe_info;
 
-void display_driver_init(multiboot_info_t *mbi) {
+int display_driver_init(multiboot_info_t *mbi) {
   assert(CHECK_FLAG(mbi->flags, 12));
   framebuffer_width = mbi->framebuffer_width;
   framebuffer_height = mbi->framebuffer_height;
@@ -37,10 +37,14 @@ void display_driver_init(multiboot_info_t *mbi) {
   framebuffer_physical = mbi->framebuffer_addr;
   framebuffer =
       mmu_map_frames((void *)(u32)mbi->framebuffer_addr, framebuffer_size);
+  if(!framebuffer) {
+    return 0;
+  }
 
   vbe_info.width = framebuffer_width;
   vbe_info.height = framebuffer_height;
   vbe_info.bpp = mbi->framebuffer_bpp;
+  return 1;
 }
 
 vfs_vm_object_t *vbe_get_vm_object(u64 length, u64 offset, vfs_fd_t *fd) {
diff --git a/kernel/drivers/vbe.h b/kernel/drivers/vbe.h
index 4df2221..369f384 100644
--- a/kernel/drivers/vbe.h
+++ b/kernel/drivers/vbe.h
@@ -1,7 +1,7 @@
 #ifndef VBE_H
 #define VBE_H
 #include <multiboot.h>
-void display_driver_init(multiboot_info_t *mb);
+int display_driver_init(multiboot_info_t *mb);
 void display_driver_cross(multiboot_info_t *mbi);
 void add_vbe_device(void);
 #endif // VBE_H
-- 
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