diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/amd64/amd64/bus_machdep.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sys/arch/amd64/amd64/bus_machdep.c b/sys/arch/amd64/amd64/bus_machdep.c index 5c0111d..3d4b302 100644 --- a/sys/arch/amd64/amd64/bus_machdep.c +++ b/sys/arch/amd64/amd64/bus_machdep.c @@ -36,6 +36,14 @@ #include <vm/pmap.h> /* + * Hyra assumes that the bootloader uses PDE[256] for some + * higher half mappings. To avoid conflicts with those mappings, + * this offset is used to start device memory at PDE[257]. This + * will give us more than enough space. + */ +#define MMIO_OFFSET (VM_HIGHER_HALF + 0x8000000000) + +/* * Map a physical device address into the kernel address * space. * @@ -58,7 +66,7 @@ bus_map(bus_addr_t addr, size_t size, int flags, void **vap) } size = ALIGN_UP(size, DEFAULT_PAGESIZE); - va = (vaddr_t)PHYS_TO_VIRT(addr); + va = addr + MMIO_OFFSET; vas = pmap_read_vas(); /* Now map it to the higher half */ |