fix: wrap pci.c in #if x86 guard with stubs for other architectures

PCI config space I/O port access (0xCF8/0xCFC) using outl/inl is
x86-only. The driver had no architecture guard, so it would fail
to compile on ARM, RISC-V, and MIPS.

Wrap the full implementation in #if defined(__i386__) and provide
no-op stubs for non-x86 targets.

Passes: make, cppcheck, QEMU smoke test.

diff --git a/src/drivers/pci.c b/src/drivers/pci.c
index c5dcd0e23a9de71483725d33d6d34e4f3b053737..657bc481ca5ee9c0f2a3e17597f933ea87fc3274 100644 (file)
--- a/src/drivers/pci.c
+++ b/src/drivers/pci.c
@@ -1,8 +1,11 @@
 #include "pci.h"
-#include "io.h"
 #include "uart_console.h"
 #include "utils.h"
 
+#if defined(__i386__) || defined(__x86_64__)
+
+#include "io.h"
+
 #define PCI_CONFIG_ADDR 0xCF8
 #define PCI_CONFIG_DATA 0xCFC
 
@@ -144,3 +147,22 @@ const struct pci_device* pci_find_class(uint8_t class_code, uint8_t subclass) {
     }
     return 0;
 }
+
+#else /* non-x86 stubs */
+
+uint32_t pci_config_read(uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset) {
+    (void)bus; (void)slot; (void)func; (void)offset;
+    return 0xFFFFFFFFU;
+}
+void pci_config_write(uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset, uint32_t value) {
+    (void)bus; (void)slot; (void)func; (void)offset; (void)value;
+}
+void pci_init(void) {
+    uart_print("[PCI] Not supported on this architecture.\n");
+}
+int pci_get_device_count(void) { return 0; }
+const struct pci_device* pci_get_device(int index) { (void)index; return 0; }
+const struct pci_device* pci_find_device(uint16_t vendor, uint16_t device) { (void)vendor; (void)device; return 0; }
+const struct pci_device* pci_find_class(uint8_t class_code, uint8_t subclass) { (void)class_code; (void)subclass; return 0; }
+
+#endif