cmds: implement pci device enumeration tool

Adds lspci tool which enumerates available PCI devices.

JIRA: RTOS-595

cmds/Makefile

@@ -7,8 +7,8 @@
 #
 
 PLO_ALLCOMMANDS = alias app bankswitch bitstream bootcm4 bootrom call console copy dump \
-  echo erase go help jffs2 kernel kernelimg map mem mpu otp phfs reboot script test-dev \
-  test-ddr wait
+  echo erase go help jffs2 kernel kernelimg lspci map mem mpu otp phfs reboot script \
+  test-dev test-ddr wait
 
 PLO_COMMANDS ?= $(PLO_ALLCOMMANDS)
 PLO_APPLETS = $(filter $(PLO_ALLCOMMANDS), $(PLO_COMMANDS))

cmds/lspci.c

@@ -0,0 +1,98 @@
+/*
+ * Phoenix-RTOS
+ *
+ * Operating system loader
+ *
+ * Enumerate PCI devices
+ *
+ * Copyright 2023 Phoenix Systems
+ * Author: Gerard Swiderski
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+
+#include <hal/ia32/pci.h>
+#include <lib/lib.h>
+
+#include "cmd.h"
+
+
+struct PCIDevice {
+	u16 vendorID;
+	u16 deviceID;
+	u8 classCode;
+	u8 subclass;
+};
+
+
+static void cmd_lspciInfo(void)
+{
+	lib_printf("enumerates PCI devices");
+}
+
+
+static void readPCIDevice(u8 bus, u8 dev, u8 func, struct PCIDevice *pciDevice)
+{
+	u32 cfg = hal_pciRead32(bus, dev, func, 0);
+	pciDevice->vendorID = (u16)cfg;
+	pciDevice->deviceID = (u16)(cfg >> 16);
+
+	cfg = hal_pciRead32(bus, dev, func, 2);
+	pciDevice->subclass = (u8)(cfg >> 16);
+	pciDevice->classCode = (u8)(cfg >> 24);
+}
+
+
+static int cmd_lspciMain(int argc, char *argv[])
+{
+	struct PCIDevice pciDevice;
+	unsigned int bus;
+	unsigned int dev;
+	unsigned int func;
+	const char *name;
+
+	if (argc != 1) {
+		log_error("\n%s: Command does not accept arguments", argv[0]);
+		return CMD_EXIT_FAILURE;
+	}
+
+	if (hal_pciDetect() < 0) {
+		log_error("\n%s: PCI bus is unavailable", argv[0]);
+		return CMD_EXIT_FAILURE;
+	}
+
+	lib_printf("\n\033[1mBUS\tDEVICE\tFUNC\tVID\tDID\tCLASS\tDESCRIPTION\033[0m\n");
+
+	for (bus = 0; bus < 256u; ++bus) {
+		for (dev = 0; dev < 32u; ++dev) {
+			for (func = 0; func < 8u; ++func) {
+				readPCIDevice(bus, dev, func, &pciDevice);
+
+				if (pciDevice.vendorID == 0xffff) {
+					continue;
+				}
+
+				lib_printf("0x%02x\t0x%02x\t0x%x\t0x%04x\t0x%04x\t0x%02x%02x\t",
+					bus, dev, func, pciDevice.vendorID, pciDevice.deviceID, pciDevice.classCode, pciDevice.subclass);
+
+				name = hal_pciClassName(pciDevice.classCode);
+				lib_printf("%.*s\n", 30, (name != NULL) ? name : "Unknown device class");
+			}
+		}
+	}
+
+	return CMD_EXIT_SUCCESS;
+}
+
+
+__attribute__((constructor)) static void cmd_lspciReg(void)
+{
+	const static cmd_t app_cmd = {
+		.name = "lspci", .run = cmd_lspciMain, .info = cmd_lspciInfo
+	};
+
+	cmd_reg(&app_cmd);
+}

hal/ia32/Makefile

@@ -9,7 +9,7 @@
 CFLAGS += -DVADDR_KERNEL_BASE=$(VADDR_KERNEL_BASE)
 CFLAGS += -Ihal/ia32
 
-PLO_COMMANDS := alias app call console copy dump echo go help kernel map mem phfs script reboot syspage wait
+PLO_COMMANDS := alias app call console copy dump echo go help kernel lspci map mem phfs script reboot syspage wait
 
 include devices/disk-bios/Makefile
 include devices/tty-bios/Makefile