diff options
Diffstat (limited to 'src/acpi')
| -rw-r--r-- | src/acpi/acpi_dmar.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/src/acpi/acpi_dmar.c b/src/acpi/acpi_dmar.c index 20a100d337..67bca5592d 100644 --- a/src/acpi/acpi_dmar.c +++ b/src/acpi/acpi_dmar.c @@ -2,7 +2,9 @@ #include <acpi/acpi.h> #include <arch/ioapic.h> +#include <assert.h> #include <cpu/cpu.h> +#include <lib.h> #include <version.h> void acpi_create_dmar(acpi_dmar_t *dmar, enum dmar_flags flags, @@ -37,8 +39,23 @@ void acpi_create_dmar(acpi_dmar_t *dmar, enum dmar_flags flags, } unsigned long acpi_create_dmar_drhd_4k(unsigned long current, u8 flags, - u16 segment, u64 bar) + u16 segment, u64 bar) { + return acpi_create_dmar_drhd(current, flags, segment, bar, 4 * KiB); +} + +unsigned long acpi_create_dmar_drhd(unsigned long current, u8 flags, + u16 segment, u64 bar, size_t size) +{ + /* + * Refer to Intel® Virtualization Technology for Directed I/O + * Architecture Specification Revision 4.1, + * size is at least 1 page and max 2^15 pages, 4 KiB each, and the bar + * should be aligned with size. + */ + assert(4 * KiB <= size && size <= (1 << 15) * 4 * KiB && IS_POWER_OF_2(size)); + assert(IS_ALIGNED(bar, size)); + dmar_entry_t *drhd = (dmar_entry_t *)current; memset(drhd, 0, sizeof(*drhd)); drhd->type = DMAR_DRHD; @@ -46,6 +63,7 @@ unsigned long acpi_create_dmar_drhd_4k(unsigned long current, u8 flags, drhd->flags = flags; drhd->segment = segment; drhd->bar = bar; + drhd->size = log2_64(size) - 12; return drhd->length; } |