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Use EFI memory map to determine attributes for Acpi mappings on arm64.

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AcpiOsMapMemory is used for device memory when e.g. an _INI method wants
to access physical memory, however, aarch64 pmap_mapbios is hardcoded to
writeback. Search for the correct memory type to use in pmap_mapbios.

Submitted by:	Greg V <greg_unrelenting.technology>
Differential Revision:	https://reviews.freebsd.org/D25201
This commit is contained in:
andrew 2020-06-28 15:03:07 +00:00
parent 5280dee6ee
commit 1ee69c6890
3 changed files with 45 additions and 2 deletions
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44
sys/arm64/arm64/machdep.c
View File

@ -120,6 +120,7 @@ int has_pan;
* passed into the kernel and used by the EFI code to call runtime services.
*/
vm_paddr_t efi_systbl_phys;
static struct efi_map_header *efihdr;
/* pagezero_* implementations are provided in support.S */
void pagezero_simple(void *);
@ -1071,11 +1072,52 @@ cache_setup(void)
}
}
int
memory_mapping_mode(vm_paddr_t pa)
{
struct efi_md *map, *p;
size_t efisz;
int ndesc, i;
if (efihdr == NULL)
return (VM_MEMATTR_WRITE_BACK);
/*
* Memory map data provided by UEFI via the GetMemoryMap
* Boot Services API.
*/
efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
map = (struct efi_md *)((uint8_t *)efihdr + efisz);
if (efihdr->descriptor_size == 0)
return (VM_MEMATTR_WRITE_BACK);
ndesc = efihdr->memory_size / efihdr->descriptor_size;
for (i = 0, p = map; i < ndesc; i++,
p = efi_next_descriptor(p, efihdr->descriptor_size)) {
if (pa < p->md_phys ||
pa >= p->md_phys + p->md_pages * EFI_PAGE_SIZE)
continue;
if (p->md_type == EFI_MD_TYPE_IOMEM ||
p->md_type == EFI_MD_TYPE_IOPORT)
return (VM_MEMATTR_DEVICE);
else if ((p->md_attr & EFI_MD_ATTR_WB) != 0 ||
p->md_type == EFI_MD_TYPE_RECLAIM)
return (VM_MEMATTR_WRITE_BACK);
else if ((p->md_attr & EFI_MD_ATTR_WT) != 0)
return (VM_MEMATTR_WRITE_THROUGH);
else if ((p->md_attr & EFI_MD_ATTR_WC) != 0)
return (VM_MEMATTR_WRITE_COMBINING);
break;
}
return (VM_MEMATTR_DEVICE);
}
void
initarm(struct arm64_bootparams *abp)
{
struct efi_fb *efifb;
struct efi_map_header *efihdr;
struct pcpu *pcpup;
char *env;
#ifdef FDT

2
sys/arm64/arm64/pmap.c
View File

@ -5449,7 +5449,7 @@ pmap_mapbios(vm_paddr_t pa, vm_size_t size)
/* L3 table is linked */
va = trunc_page(va);
pa = trunc_page(pa);
pmap_kenter(va, size, pa, VM_MEMATTR_WRITE_BACK);
pmap_kenter(va, size, pa, memory_mapping_mode(pa));
}
return ((void *)(va + offset));

1
sys/arm64/include/machdep.h
View File

@ -56,6 +56,7 @@ vm_offset_t parse_boot_param(struct arm64_bootparams *abp);
#ifdef FDT
void parse_fdt_bootargs(void);
#endif
int memory_mapping_mode(vm_paddr_t pa);
extern void (*pagezero)(void *);
#endif /* _KERNEL */