diff options
Diffstat (limited to 'sys/arch/amd64')
| -rw-r--r-- | sys/arch/amd64/pci/pci_machdep.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/sys/arch/amd64/pci/pci_machdep.c b/sys/arch/amd64/pci/pci_machdep.c index fa6e492..50d0d57 100644 --- a/sys/arch/amd64/pci/pci_machdep.c +++ b/sys/arch/amd64/pci/pci_machdep.c @@ -29,8 +29,14 @@ #include <sys/types.h> #include <sys/param.h> +#include <sys/errno.h> #include <dev/pci/pci.h> +#include <dev/pci/pciregs.h> #include <machine/pio.h> +#include <machine/bus.h> + +/* Base address masks for BARs */ +#define PCI_BAR_MEMMASK ~7 static inline uint32_t pci_conf_addr(struct pci_device *dev, uint32_t offset) @@ -42,6 +48,26 @@ pci_conf_addr(struct pci_device *dev, uint32_t offset) (dev->bus << 16); } +/* + * Convert a BAR number to BAR register offset. + * + * @dev: Device of BAR to check. + * @bar: Bar number. + */ +static inline uint8_t +pci_get_barreg(struct pci_device *dev, uint8_t bar) +{ + switch (bar) { + case 0: return PCIREG_BAR0; + case 1: return PCIREG_BAR1; + case 2: return PCIREG_BAR2; + case 3: return PCIREG_BAR3; + case 4: return PCIREG_BAR4; + case 5: return PCIREG_BAR5; + default: return 0; + } +} + pcireg_t pci_readl(struct pci_device *dev, uint32_t offset) { @@ -61,3 +87,37 @@ pci_writel(struct pci_device *dev, uint32_t offset, pcireg_t val) outl(0xCF8, address); outl(0xCFC, val); } + +/* + * Map a BAR into kernel memory. + * + * @dev: Device of BAR to map. + * @barno: BAR number to map. + * @vap: Resulting virtual address. + */ +int +pci_map_bar(struct pci_device *dev, uint8_t barno, void **vap) +{ + uint8_t barreg = pci_get_barreg(dev, barno); + uintptr_t tmp, bar; + uint32_t size; + + if (barreg == 0) + return -EINVAL; + + /* + * Get the length of the region this BAR covers by writing a + * mask of 32 bits into the BAR register and seeing how many + * bits are unset. We can use this to compute the size of the + * region. We know that log2(len) bits must be unset. + */ + tmp = pci_readl(dev, barreg); + pci_writel(dev, barreg, 0xFFFFFFFF); + size = pci_readl(dev, barreg); + size = ~size + 1; + + /* Restore old value and map the BAR */ + pci_writel(dev, barreg, tmp); + bar = dev->bar[barno] & PCI_BAR_MEMMASK; + return bus_map(bar, size, 0, vap); +} |