acpi: Add support for DMAR tables (Intel IOMMU support)
Adds lowlevel handling of DMAR tables for use by mainboards'
ACPI code. Not much automagic (yet).
Change-Id: Ia86e950dfcc5b9994202ec0e2f6d9a2912c74ad8
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1654
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/arch/x86/boot/acpi.c b/src/arch/x86/boot/acpi.c
index 9881ffe..72b6d96 100644
--- a/src/arch/x86/boot/acpi.c
+++ b/src/arch/x86/boot/acpi.c
@@ -334,6 +334,71 @@
header->checksum = acpi_checksum((void *)srat, header->length);
}
+unsigned long __attribute__((weak)) acpi_fill_dmar(unsigned long current)
+{
+ return current;
+}
+
+void acpi_create_dmar(acpi_dmar_t *dmar)
+{
+ acpi_header_t *header = &(dmar->header);
+ unsigned long current = (unsigned long)dmar + sizeof(acpi_dmar_t);
+
+ memset((void *)dmar, 0, sizeof(acpi_dmar_t));
+
+ /* Fill out header fields. */
+ memcpy(header->signature, "DMAR", 4);
+ memcpy(header->oem_id, OEM_ID, 6);
+ memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
+ memcpy(header->asl_compiler_id, ASLC, 4);
+
+ header->length = sizeof(acpi_dmar_t);
+ header->revision = 1;
+
+ dmar->host_address_width = 40 - 1; /* FIXME: == MTRR size? */
+ dmar->flags = 0;
+
+ current = acpi_fill_dmar(current);
+
+ /* (Re)calculate length and checksum. */
+ header->length = current - (unsigned long)dmar;
+ header->checksum = acpi_checksum((void *)dmar, header->length);
+}
+
+unsigned long acpi_create_dmar_drhd(unsigned long current, u8 flags,
+ u16 segment, u32 bar)
+{
+ dmar_entry_t *drhd = (dmar_entry_t *)current;
+ memset(drhd, 0, sizeof(*drhd));
+ drhd->type = DMAR_DRHD;
+ drhd->length = sizeof(*drhd); /* will be fixed up later */
+ drhd->flags = flags;
+ drhd->segment = segment;
+ drhd->bar = bar;
+
+ return drhd->length;
+}
+
+void acpi_dmar_drhd_fixup(unsigned long base, unsigned long current)
+{
+ dmar_entry_t *drhd = (dmar_entry_t *)base;
+ drhd->length = current - base;
+}
+
+unsigned long acpi_create_dmar_drhd_ds_pci(unsigned long current, u8 segment,
+ u8 dev, u8 fn)
+{
+ dev_scope_t *ds = (dev_scope_t *)current;
+ memset(ds, 0, sizeof(*ds));
+ ds->type = SCOPE_PCI_ENDPOINT;
+ ds->length = sizeof(*ds) + 2; /* we don't support longer paths yet */
+ ds->start_bus = segment;
+ ds->path[0].dev = dev;
+ ds->path[0].fn = fn;
+
+ return ds->length;
+}
+
/* http://h21007.www2.hp.com/portal/download/files/unprot/Itanium/slit.pdf */
void acpi_create_slit(acpi_slit_t *slit)
{
diff --git a/src/arch/x86/include/arch/acpi.h b/src/arch/x86/include/arch/acpi.h
index 0b2cbf4..b39e8c0 100644
--- a/src/arch/x86/include/arch/acpi.h
+++ b/src/arch/x86/include/arch/acpi.h
@@ -187,6 +187,54 @@
u32 flags; /* Multiple APIC flags */
} __attribute__ ((packed)) acpi_madt_t;
+enum dev_scope_type {
+ SCOPE_PCI_ENDPOINT = 1,
+ SCOPE_PCI_SUB = 2,
+ SCOPE_IOAPIC = 3,
+ SCOPE_MSI_HPET = 4
+};
+
+typedef struct dev_scope {
+ u8 type;
+ u8 length;
+ u8 reserved[2];
+ u8 enumeration;
+ u8 start_bus;
+ struct {
+ u8 dev;
+ u8 fn;
+ } __attribute__((packed)) path[0];
+} __attribute__ ((packed)) dev_scope_t;
+
+enum dmar_type {
+ DMAR_DRHD = 0,
+ DMAR_RMRR = 1,
+ DMAR_ATSR = 2,
+ DMAR_RHSA = 3
+};
+
+enum {
+ DRHD_INCLUDE_PCI_ALL = 1
+};
+
+typedef struct dmar_entry {
+ u16 type;
+ u16 length;
+ u8 flags;
+ u8 reserved;
+ u16 segment;
+ u64 bar;
+} __attribute__ ((packed)) dmar_entry_t;
+
+/* DMAR (DMA Remapping Reporting Structure) */
+typedef struct acpi_dmar {
+ struct acpi_table_header header;
+ u8 host_address_width;
+ u8 flags;
+ u8 reserved[10];
+ dmar_entry_t structure[0];
+} __attribute__ ((packed)) acpi_dmar_t;
+
/* MADT: APIC Structure Types */
/* TODO: Convert to ALLCAPS. */
enum acpi_apic_types {
@@ -483,6 +531,15 @@
void acpi_create_facs(acpi_facs_t *facs);
+void acpi_create_dmar(acpi_dmar_t *dmar);
+unsigned long acpi_create_dmar_drhd(unsigned long current, u8 flags,
+ u16 segment, u32 bar);
+void acpi_dmar_drhd_fixup(unsigned long base, unsigned long current);
+unsigned long acpi_create_dmar_drhd_ds_pci(unsigned long current, u8 segment,
+ u8 dev, u8 fn);
+
+unsigned long acpi_fill_dmar(unsigned long);
+
#if CONFIG_HAVE_ACPI_SLIC
unsigned long acpi_create_slic(unsigned long current);
#endif