feat: used linker to link pci drivers

kernel/drivers/ide.c

@@ -326,7 +326,7 @@ uint8_t ide_pci_validate(const pci_device *device);
 
 uint8_t ide_pci_initialize(pci_device *device);
 
-const pci_driver ide_pci_driver = {
+PCI_DRIVER(
         .name = "pci-ide",
         .description = "Default PCI IDE Driver",
         .order = 0xFF, // let other block_dev_drivers precede if they can
@@ -338,7 +338,7 @@ const pci_driver ide_pci_driver = {
 
         .validate = ide_pci_validate,
         .initialize = ide_pci_initialize,
-};
+);
 
 uint8_t ide_pci_validate(const pci_device *device) {
     if (device->class != PCI_CLASS_MASS_STORAGE
@@ -549,10 +549,6 @@ void ide_print_devices() {
     }
 }
 
-void ide_register() {
-    pci_register_driver(&ide_pci_driver);
-}
-
 uint8_t ide_read_ata_access(uint8_t direction, uint8_t drive, uint32_t lba, uint8_t numsects, void *target) {
     uint8_t lba_mode /* 0: CHS, 1:LBA28, 2: LBA48 */, dma /* 0: No DMA, 1: DMA */, cmd;
     uint8_t lba_io[6];

kernel/drivers/ide.h

@@ -7,8 +7,6 @@
 
 #include <types.h>
 
-void ide_register();
-
 uint8_t ide_access(uint8_t direction, uint8_t drive, uint32_t lba, uint8_t numsects, void *target);
 
 void ide_print_devices();

kernel/drivers/pci.c

@@ -34,7 +34,7 @@
 #define MASK_BAR_IOSPACE 0xFFFFFFFC
 #define MASK_BAR_MEMSPACE 0xFFFFFFF0
 
-const pci_driver pci_internal_secondary_bus = {
+const struct pci_driver pci_internal_secondary_bus = {
         .name = "pci-secondary-bus",
         .description = "A PCI bus connected to the primary bus",
         .order = 0,
@@ -45,23 +45,16 @@ const pci_driver pci_internal_secondary_bus = {
         .initialize = NULL,
 };
 
-const pci_driver *pci_drivers[MAX_PCI_DRIVERS];
+//const pci_driver *pci_drivers[MAX_PCI_DRIVERS];
+extern struct pci_driver __start_pci_drivers[];
+extern struct pci_driver __stop_pci_drivers[];
+#define NUM_DRIVERS ((size_t)(__stop_pci_drivers - __start_pci_drivers))
+#define DRIVER(i) ((__start_pci_drivers) + (i))
 int last_pci_device_index = 0;
 pci_device pci_devices[MAX_PCI_DEVICES];
 
 void pci_check_bus(uint8_t bus);
 
-uint32_t pci_register_driver(const pci_driver *pci_driver) {
-    for (int i = 0; i < MAX_PCI_DRIVERS; ++i) {
-        if (pci_drivers[i] != NULL) {
-            continue;
-        }
-        pci_drivers[i] = pci_driver;
-        return PCI_REGISTER_OK;
-    }
-    return PCI_REGISTER_ERR_FULL;
-}
-
 uint32_t pci_config_address(uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset) {
     return PCI_CONFIG_ENABLE
            | ((uint32_t) bus << PCI_CONFIG_SHIFT_BUS_NUMBER)
@@ -141,23 +134,23 @@ void pci_pick_driver(pci_device *device) {
     }
 
     // use normal drivers
-    for (int i = 0; i < MAX_PCI_DRIVERS; ++i) {
-        if (pci_drivers[i] == NULL) {
+    for (int i = 0; i < NUM_DRIVERS; ++i) {
+//        if (DRIVER(i) == NULL) {
+//            continue;
+//        }
+        if (device->class != DRIVER(i)->pci_class) {
             continue;
         }
-        if (device->class != pci_drivers[i]->pci_class) {
+        if (DRIVER(i)->pci_use_subclass && device->subclass != DRIVER(i)->pci_subclass) {
             continue;
         }
-        if (pci_drivers[i]->pci_use_subclass && device->subclass != pci_drivers[i]->pci_subclass) {
+        if (!DRIVER(i)->validatable) {
             continue;
         }
-        if (!pci_drivers[i]->validatable) {
+        if (DRIVER(i)->validate(device) != PCI_VALIDATE_OK) {
             continue;
         }
-        if (pci_drivers[i]->validate(device) != PCI_VALIDATE_OK) {
-            continue;
-        }
-        device->pci_driver = pci_drivers[i];
+        device->pci_driver = DRIVER(i);
     }
 }
 

kernel/drivers/pci.h

@@ -76,14 +76,21 @@
 
 #define PCI_INTERRUPT_LINE_DISABLED 0xff
 
-typedef struct pci_driver pci_driver;
+#ifndef PCI_DRIVER_ALIGNMENT
+#if defined(__LP64__)
+#define PCI_DRIVER_ALIGNMENT 16
+#else
+#define PCI_DRIVER_ALIGNMENT 8
+#endif
+#endif
+
 typedef struct pci_device pci_device;
 
 typedef uint8_t (*pci_driver_validate)(const pci_device *);
 
 typedef uint8_t (*pci_driver_initialize)(pci_device *);
 
-typedef struct pci_driver {
+struct pci_driver {
     const char *name;
     const char *description;
     uint8_t order;
@@ -96,7 +103,16 @@ typedef struct pci_driver {
     };
     pci_driver_validate validate;
     pci_driver_initialize initialize;
-} pci_driver;
+} __attribute__((__aligned__(PCI_DRIVER_ALIGNMENT)));
+
+#define PCI_DRIVER_NAME(counter) DRIVER_CAT(pci_driver_, counter)
+#define DRIVER_CAT(a, b) DRIVER_DUMMY() a ## b
+#define DRIVER_DUMMY()
+
+#define PCI_DRIVER(data...) \
+    static struct pci_driver PCI_DRIVER_NAME(__COUNTER__) \
+    __attribute((__used__, __section__("pci_drivers")))   \
+    = { data }
 
 typedef struct {
     uint32_t address;
@@ -142,7 +158,7 @@ typedef struct pci_device {
     bar_info bar3;
     bar_info bar4;
     bar_info bar5;
-    const pci_driver *pci_driver;
+    const struct pci_driver *pci_driver;
     struct {
         uint8_t present: 1;
     } device_state;
@@ -198,8 +214,6 @@ void pci_pretty_print();
 
 #endif
 
-uint32_t pci_register_driver(const pci_driver *pci_driver);
-
 void pci_sort_drivers();
 
 void pci_init_drivers();

kernel/kernel.c

@@ -32,12 +32,7 @@ void init_mmap(multiboot_info_t *multiboot_info) {
     }
 }
 
-void register_pci_drivers() {
-    ide_register();
-}
-
 void init_pci_system() {
-    register_pci_drivers();
     pci_sort_drivers();
     pci_scan();
     pci_init_drivers();