feature (PCI): implemented a BASIC pci device manager

inc/drivers/pci.h

@@ -230,8 +230,25 @@ typedef struct {
     uint8_t             max_latency;
 } __attribute__((packed)) pci_header_0_T;
 
-void        pci_init                ();
-string_t    pci_get_subclass_string (pci_class_E class, uint8_t subclass);
-string_t    pci_get_vendor_string   (uint16_t vendor_id);
+typedef struct pci_device_T pci_device_T;
+struct pci_device_T {
+    pci_device_header_T*    header;
+    pci_device_T*           prev;
+    pci_device_T*           next;
+};
+
+typedef struct {
+    pci_device_T*   devices;
+} pci_manager_T;
+
+void            pci_init                    ();
+
+void            pci_manager_add_device      (pci_device_header_T* header);
+void            pci_manager_remove_device   (pci_device_T* device);
+pci_device_T*   pci_manager_find_device     (pci_class_E class, uint8_t subclass, uint8_t progif);
+void            pci_manager_dump_devices    ();
+
+string_t        pci_get_subclass_string     (pci_class_E class, uint8_t subclass);
+string_t        pci_get_vendor_string       (uint16_t vendor_id);
 
 #endif // NOXOS_PCI_H

src/boot/kmain.c

@@ -60,20 +60,7 @@ void kmain(boot_info_T boot_info) {
 
     log(LOG_INFO, "!=====[ Kernel Initialized ]=====!\n");
 
-
-    vfs_node_T* node = vfs_resolve_path(&g_root_fs, "/initrd/test.elf");
-    void* buffer = memory_allocate(node->size);
-    vfs_file_read(node, 0, node->size, buffer);
-
-    elf_executable_T* exec = elf_executable_create(buffer);
-
-    pid_t   process = process_spawn(PROCESS_KERNEL, "test 1", exec, buffer);
-    void* func = (void*)symbol_resolve_from_name(scheduler_get_process(process)->executable->symbols,
-                                          scheduler_get_process(process)->executable->num_symbols,
-                                          "_start")->address + MEM_REGION_PROCESS_EXEC;
-    thread_start(thread_spawn(process, func));
-
-    scheduler_dump_info(scheduler_get_process(PROCESS_KERNEL), 0);
+    pci_device_T* ahci_controller = pci_manager_find_device(PCI_CLASS_MASS_STORAGE_CONTROLLER, PCI_SUBCLASS_SERIAL_ATA_CONTROLLER, 1);
 
     CORE_HALT_FOREVER
 }

src/drivers/pci.c

@@ -5,6 +5,9 @@
 #include "drivers/acpi/mcfg.h"
 #include "mm/page_map.h"
 #include "utils/logger.h"
+#include "utils/memory.h"
+
+pci_manager_T* g_pci_manager;
 
 string_t pci_get_subclass_string(pci_class_E class, uint8_t subclass) {
     switch (class) {
@@ -248,8 +251,7 @@ void pci_enumerate_function(void* device_address, uint8_t function) {
     pci_device_header_T* device_header = (pci_device_header_T*)function_address;
     if (device_header->device_id == 0 || device_header->device_id == 0xFFFF) return;
 
-    log(LOG_DEBUG, "<PCI> Found %s  -  %s  -  %xw:%xw", pci_get_subclass_string(device_header->main_class, device_header->subclass),
-        pci_get_vendor_string(device_header->vendor_id), device_header->vendor_id, device_header->device_id);
+    pci_manager_add_device(device_header);
 }
 
 void pci_enumerate_device(void* bus_address, uint8_t device) {
@@ -277,6 +279,11 @@ void pci_enumerate_bus(void* base, uint8_t bus) {
 }
 
 void pci_init() {
+
+    g_pci_manager = memory_allocate(sizeof(pci_manager_T));
+    g_pci_manager->devices = NULL;
+
+    // enumerate devices
     uint32_t num_configs = (g_acpi_table_mcfg->header.length - sizeof(acpi_mcfg_T)) / sizeof(acpi_mcfg_device_config_T);
     acpi_mcfg_device_config_T* configs = (acpi_mcfg_device_config_T*)(&g_acpi_table_mcfg[1]);
 
@@ -287,4 +294,58 @@ void pci_init() {
             pci_enumerate_bus((void*)config->base, bus);
         }
     }
+
+    pci_manager_dump_devices();
+}
+
+void pci_manager_add_device(pci_device_header_T* header) {
+    pci_device_T* device = memory_allocate(sizeof(pci_device_T));
+
+    device->header = header;
+
+    // link in front of list
+    device->prev           = NULL;
+    device->next           = g_pci_manager->devices;
+    g_pci_manager->devices = device;
+    if (device->next != NULL) {
+        device->next->prev = device;
+    }
+}
+
+void pci_manager_remove_device(pci_device_T* device) {
+    if (device->prev != NULL) {
+        device->prev->next = device->next;
+    }
+    if (device->next != NULL) {
+        device->next->prev = device->prev;
+    }
+
+    memory_free(device);
+}
+
+pci_device_T* pci_manager_find_device(pci_class_E class, uint8_t subclass, uint8_t progif) {
+    pci_device_T* device = g_pci_manager->devices;
+    while (device != NULL) {
+        if (device->header->main_class != class || device->header->subclass != subclass || device->header->progif != progif) {
+            device = device->next;
+            continue;
+        }
+
+        return device;
+    }
+
+    log(LOG_WARNING, "<PCI> %s with progif 0x%xb not found!", pci_get_subclass_string(class, subclass), progif);
+
+    return NULL;
+}
+
+void pci_manager_dump_devices() {
+    log(LOG_DEBUG, "<PCI> Devices:");
+    pci_device_T* device = g_pci_manager->devices;
+    while (device != NULL) {
+        log(LOG_DEBUG, "      %s  -  %s  -  %xw:%xw",
+            pci_get_subclass_string(device->header->main_class, device->header->subclass),
+            pci_get_vendor_string(device->header->vendor_id), device->header->vendor_id, device->header->device_id);
+        device = device->next;
+    }
 }