d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Raise the size of L3 table for early devmap on arm64

Browse Source 
Some driver (like efifb) needs to map more than the current L2_SIZE
Raise the size so we can map the framebuffer setup by the bootloader.

Reviewed by:	cognet
This commit is contained in:
Emmanuel Vadot 2018-07-19 21:58:06 +00:00
parent 038c615929
commit c54fe25dcb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=336519
3 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sys/arm64/arm64/pmap.c
View File

@ -836,7 +836,7 @@ pmap_bootstrap(vm_offset_t l0pt, vm_offset_t l1pt, vm_paddr_t kernstart,
freemempos = pmap_bootstrap_l2(l1pt, va, freemempos);
/* And the l3 tables for the early devmap */
freemempos = pmap_bootstrap_l3(l1pt,
VM_MAX_KERNEL_ADDRESS - L2_SIZE, freemempos);
VM_MAX_KERNEL_ADDRESS - (PMAP_MAPDEV_EARLY_SIZE), freemempos);
cpu_tlb_flushID();
@ -858,7 +858,7 @@ pmap_bootstrap(vm_offset_t l0pt, vm_offset_t l1pt, vm_paddr_t kernstart,
virtual_avail = preinit_map_va + PMAP_PREINIT_MAPPING_SIZE;
virtual_avail = roundup2(virtual_avail, L1_SIZE);
virtual_end = VM_MAX_KERNEL_ADDRESS - L2_SIZE;
virtual_end = VM_MAX_KERNEL_ADDRESS - (PMAP_MAPDEV_EARLY_SIZE);
kernel_vm_end = virtual_avail;
pa = pmap_early_vtophys(l1pt, freemempos);

2
sys/arm64/include/pte.h
View File

@ -109,6 +109,8 @@ typedef uint64_t pt_entry_t; /* page table entry */
/* 0x2 also marks an invalid address */
#define L3_PAGE 0x3
#define PMAP_MAPDEV_EARLY_SIZE (L2_SIZE * 4)
#define L0_ENTRIES_SHIFT 9
#define L0_ENTRIES (1 << L0_ENTRIES_SHIFT)
#define L0_ADDR_MASK (L0_ENTRIES - 1)

4
sys/kern/subr_devmap.c
View File

@ -305,8 +305,8 @@ pmap_mapdev_attr(vm_offset_t pa, vm_size_t size, vm_memattr_t ma)
if (early_boot) {
akva_devmap_vaddr = trunc_page(akva_devmap_vaddr - size);
va = akva_devmap_vaddr;
KASSERT(va >= VM_MAX_KERNEL_ADDRESS - L2_SIZE,
("Too many early devmap mappings"));
KASSERT(va >= (VM_MAX_KERNEL_ADDRESS - (PMAP_MAPDEV_EARLY_SIZE)),
("Too many early devmap mappings 2"));
} else
va = kva_alloc(size);
if (!va)