X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=kitten%2Farch%2Fx86_64%2Fkernel%2Fresource.c;fp=kitten%2Farch%2Fx86_64%2Fkernel%2Fresource.c;h=a85416fa565b5166576bc48fd8967fd715196b32;hb=66a1a4c7a9edcd7d8bc207aca093d694a6e6b5b2;hp=0000000000000000000000000000000000000000;hpb=f7cf9c19ecb0a589dd45ae0d2c91814bd3c2acc2;p=palacios.git diff --git a/kitten/arch/x86_64/kernel/resource.c b/kitten/arch/x86_64/kernel/resource.c new file mode 100644 index 0000000..a85416f --- /dev/null +++ b/kitten/arch/x86_64/kernel/resource.c @@ -0,0 +1,200 @@ +#include +#include +#include +#include +#include +#include +#include + +/** + * 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]); +} +