diff options
| author | Ian Moffett <ian@osmora.org> | 2024-07-10 16:21:47 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2024-07-10 16:21:47 -0400 |
| commit | 7a915a81d23263df634a6ae626e0bc2f6f4b38b5 (patch) | |
| tree | 36f3bc8b6e6d147ca32582f652b5cfae56d89e1e /sys | |
| parent | 3125adaf201fbd8436d63203ae6febc29b59b78f (diff) | |
kernel/amd64: bus: Fix memory mapping conflicts
Signed-off-by: Ian Moffett <ian@osmora.org>
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 */ |