diff options
| author | Ian Moffett <ian@osmora.org> | 2024-07-11 01:27:40 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2024-07-11 01:27:40 -0400 |
| commit | 1d258c4bfeaab845b250006ed8bf3df6776b5c11 (patch) | |
| tree | 863e6db51e33c1e70984c6d09d2139c8e8463043 /sys/include | |
| parent | 26e17c070f845e4d93bff080eead9f5d22253319 (diff) | |
kernel/amd64: bus: Move MMIO_OFFSET to bus.h
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sys/include')
| -rw-r--r-- | sys/include/arch/amd64/bus.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/include/arch/amd64/bus.h b/sys/include/arch/amd64/bus.h index 8f9bc39..b9d3362 100644 --- a/sys/include/arch/amd64/bus.h +++ b/sys/include/arch/amd64/bus.h @@ -32,6 +32,14 @@ #include <sys/types.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) + typedef uint64_t bus_addr_t; int bus_map(bus_addr_t addr, size_t size, int flags, void **vap); |