--- /dev/null
+#include <lwk/kernel.h>
+#include <lwk/init.h>
+#include <lwk/resource.h>
+#include <arch/page.h>
+#include <arch/io.h>
+#include <arch/sections.h>
+#include <arch/e820.h>
+
+/**
+ * Standard PC resources.
+ */
+struct resource standard_io_resources[] = {
+ { .name = "dma1", .start = 0x00, .end = 0x1f,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+ { .name = "pic1", .start = 0x20, .end = 0x21,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+ { .name = "timer0", .start = 0x40, .end = 0x43,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+ { .name = "timer1", .start = 0x50, .end = 0x53,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+ { .name = "keyboard", .start = 0x60, .end = 0x6f,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+ { .name = "dma page reg", .start = 0x80, .end = 0x8f,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+ { .name = "pic2", .start = 0xa0, .end = 0xa1,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+ { .name = "dma2", .start = 0xc0, .end = 0xdf,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+ { .name = "fpu", .start = 0xf0, .end = 0xff,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO }
+};
+
+#define STANDARD_IO_RESOURCES \
+ (sizeof standard_io_resources / sizeof standard_io_resources[0])
+
+#define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
+
+struct resource data_resource = {
+ .name = "Kernel data",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_RAM,
+};
+struct resource code_resource = {
+ .name = "Kernel code",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_RAM,
+};
+
+#define IORESOURCE_ROM (IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM)
+
+static struct resource system_rom_resource = {
+ .name = "System ROM",
+ .start = 0xf0000,
+ .end = 0xfffff,
+ .flags = IORESOURCE_ROM,
+};
+
+static struct resource extension_rom_resource = {
+ .name = "Extension ROM",
+ .start = 0xe0000,
+ .end = 0xeffff,
+ .flags = IORESOURCE_ROM,
+};
+
+static struct resource adapter_rom_resources[] = {
+ { .name = "Adapter ROM", .start = 0xc8000, .end = 0,
+ .flags = IORESOURCE_ROM },
+ { .name = "Adapter ROM", .start = 0, .end = 0,
+ .flags = IORESOURCE_ROM },
+ { .name = "Adapter ROM", .start = 0, .end = 0,
+ .flags = IORESOURCE_ROM },
+ { .name = "Adapter ROM", .start = 0, .end = 0,
+ .flags = IORESOURCE_ROM },
+ { .name = "Adapter ROM", .start = 0, .end = 0,
+ .flags = IORESOURCE_ROM },
+ { .name = "Adapter ROM", .start = 0, .end = 0,
+ .flags = IORESOURCE_ROM }
+};
+
+#define ADAPTER_ROM_RESOURCES \
+ (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
+
+static struct resource video_rom_resource = {
+ .name = "Video ROM",
+ .start = 0xc0000,
+ .end = 0xc7fff,
+ .flags = IORESOURCE_ROM,
+};
+
+static struct resource video_ram_resource = {
+ .name = "Video RAM area",
+ .start = 0xa0000,
+ .end = 0xbffff,
+ .flags = IORESOURCE_RAM,
+};
+
+#define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
+
+static int __init
+romchecksum(unsigned char *rom, unsigned long length)
+{
+ unsigned char *p, sum = 0;
+
+ for (p = rom; p < rom + length; p++)
+ sum += *p;
+ return sum == 0;
+}
+
+static void __init
+probe_roms(void)
+{
+ unsigned long start, length, upper;
+ unsigned char *rom;
+ int i;
+
+ /* video rom */
+ upper = adapter_rom_resources[0].start;
+ for (start = video_rom_resource.start; start < upper; start += 2048) {
+ rom = isa_bus_to_virt(start);
+ if (!romsignature(rom))
+ continue;
+
+ video_rom_resource.start = start;
+
+ /* 0 < length <= 0x7f * 512, historically */
+ length = rom[2] * 512;
+
+ /* if checksum okay, trust length byte */
+ if (length && romchecksum(rom, length))
+ video_rom_resource.end = start + length - 1;
+
+ request_resource(&iomem_resource, &video_rom_resource);
+ break;
+ }
+
+ start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
+ if (start < upper)
+ start = upper;
+
+ /* system rom */
+ request_resource(&iomem_resource, &system_rom_resource);
+ upper = system_rom_resource.start;
+
+ /* check for extension rom (ignore length byte!) */
+ rom = isa_bus_to_virt(extension_rom_resource.start);
+ if (romsignature(rom)) {
+ length = extension_rom_resource.end - extension_rom_resource.start + 1;
+ if (romchecksum(rom, length)) {
+ request_resource(&iomem_resource, &extension_rom_resource);
+ upper = extension_rom_resource.start;
+ }
+ }
+
+ /* check for adapter roms on 2k boundaries */
+ for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
+ rom = isa_bus_to_virt(start);
+ if (!romsignature(rom))
+ continue;
+
+ /* 0 < length <= 0x7f * 512, historically */
+ length = rom[2] * 512;
+
+ /* but accept any length that fits if checksum okay */
+ if (!length || start + length > upper || !romchecksum(rom, length))
+ continue;
+
+ adapter_rom_resources[i].start = start;
+ adapter_rom_resources[i].end = start + length - 1;
+ request_resource(&iomem_resource, &adapter_rom_resources[i]);
+
+ start = adapter_rom_resources[i++].end & ~2047UL;
+ }
+}
+
+void __init
+init_resources(void)
+{
+ unsigned int i;
+
+ code_resource.start = virt_to_phys(&_text);
+ code_resource.end = virt_to_phys(&_etext)-1;
+ data_resource.start = virt_to_phys(&_etext);
+ data_resource.end = virt_to_phys(&_edata)-1;
+
+ /*
+ * Request address space for all standard RAM and ROM resources
+ * and also for regions reported as reserved by the e820.
+ */
+ probe_roms();
+ e820_reserve_resources();
+
+ request_resource(&iomem_resource, &video_ram_resource);
+
+ /* request I/O space for devices used on all i[345]86 PCs */
+ for (i = 0; i < STANDARD_IO_RESOURCES; i++)
+ request_resource(&ioport_resource, &standard_io_resources[i]);
+}
+
