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https://github.com/Mathewnd/Astral.git
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Matheus
107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
#ifdef _PCIARCH_H
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#error this file should only be included ONCE and only in the io/pci.c file
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#else
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#define _PCIARCH_H
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#include <stdint.h>
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#include <stddef.h>
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#include <arch/io.h>
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#include <arch/acpi.h>
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#include <kernel/pmm.h>
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#include <kernel/alloc.h>
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#include <arch/cpu.h>
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static size_t mcfgentrycount;
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static mcfgentry_t *mcfgentries;
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static uint32_t (*pci_archread32)(int bus, int device, int function, uint32_t offset);
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static void (*pci_archwrite32)(int bus, int device, int function, uint32_t offset, uint32_t value);
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#define CONFADD 0xcf8
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#define CONFDATA 0xcfc
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static uint32_t legacy_read32(int bus, int device, int function, uint32_t offset) {
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uint32_t confadd = 0x80000000 | (offset & ~0x3) | (function << 8) | (device << 11) | (bus << 16);
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outd(CONFADD, confadd);
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return ind(CONFDATA);
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}
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static void legacy_write32(int bus, int device, int function, uint32_t offset, uint32_t value) {
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uint32_t confadd = 0x80000000 | (offset & ~0x3) | (function << 8) | (device << 11) | (bus << 16);
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outd(CONFADD, confadd);
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outd(CONFDATA, value);
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}
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static inline mcfgentry_t *getmcfgentry(int bus) {
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mcfgentry_t *entry;
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int i;
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for (i = 0; i < mcfgentrycount; ++i) {
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entry = &mcfgentries[i];
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if (bus >= entry->startbus && bus <= entry->endbus)
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break;
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}
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if (i == mcfgentrycount)
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entry = NULL;
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return entry;
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}
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static uint32_t mcfg_read32(int bus, int device, int function, uint32_t offset) {
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mcfgentry_t *entry = getmcfgentry(bus);
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if (entry == NULL)
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return 0xffffffff;
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uint64_t base = (uint64_t)entry->address;
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volatile uint32_t *address = (uint32_t *)((uintptr_t)base + (((bus - entry->startbus) << 20) | (device << 15) | (function << 12) | (offset & ~0x3)));
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return *address;
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}
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static void mcfg_write32(int bus, int device, int function, uint32_t offset, uint32_t value) {
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mcfgentry_t *entry = getmcfgentry(bus);
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uint64_t base = (uint64_t)entry->address;
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volatile uint32_t *address = (uint32_t *)((uintptr_t)base + (((bus - entry->startbus) << 20) | (device << 15) | (function << 12) | (offset & ~0x3)));
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*address = value;
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}
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static uint64_t msiformatmessage(uint32_t *data, int vector, int edgetrigger, int deassert) {
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*data = (edgetrigger << 15) | (deassert << 14) | vector;
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return 0xfee00000 | (_cpu()->id << 12);
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}
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// in PCIe, every function has 4096 bytes of config space for it.
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// there are 8 functions per device and 32 devices per bus
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#define MCFG_MAPPING_SIZE(buscount) (4096l * 8l * 32l * (buscount))
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static void pci_archinit() {
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mcfg_t *mcfg = arch_acpi_findtable("MCFG", 0);
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if (mcfg) {
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printf("pci: MCFG table found. Using extended configuration space\n");
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pci_archread32 = mcfg_read32;
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pci_archwrite32 = mcfg_write32;
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mcfgentrycount = (mcfg->header.length - sizeof(sdtheader_t)) / sizeof(mcfgentry_t);
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mcfgentries = alloc(sizeof(mcfgentry_t) * mcfgentrycount);
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__assert(mcfgentries);
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memcpy(mcfgentries, mcfg->entries, sizeof(mcfgentry_t) * mcfgentrycount);
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for (int i = 0; i < mcfgentrycount; ++i) {
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void *phys = (void *)mcfgentries[i].address;
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uintmax_t pageoffset = (uintptr_t)phys % PAGE_SIZE;
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size_t mappingsize = pageoffset + MCFG_MAPPING_SIZE(mcfgentries[i].endbus - mcfgentries[i].startbus + 1);
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void *virt = vmm_map(NULL, mappingsize, VMM_FLAGS_PHYSICAL,
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ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC | ARCH_MMU_FLAGS_UC, phys);
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__assert(virt);
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mcfgentries[i].address = (uintptr_t)virt + pageoffset;
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}
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} else {
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printf("pci: MCFG table not found. Falling back to legacy access mechanism\n");
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pci_archread32 = legacy_read32;
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pci_archwrite32 = legacy_write32;
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}
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}
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#endif
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