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Add support for moving the DMAP range. This is needed as some AMD SoCs

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place physical memory at an address outside the old DMAP range. This is an
issue as we rely on being able to move from PA -> VA using this range.

Obtained from:	Patrick Wildt <patrick@bitrig.org> (earlier version)
Sponsored by:	ABT Systems Ltd
Differential Revision:	https://reviews.freebsd.org/D3885
This commit is contained in:
Andrew Turner 2015-11-24 11:01:43 +00:00
parent 547831b6fd
commit ac4dad9e2f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=291246
2 changed files with 30 additions and 9 deletions
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27
sys/arm64/arm64/pmap.c
View File

@ -215,6 +215,8 @@ struct msgbuf *msgbufp = NULL;
static struct rwlock_padalign pvh_global_lock;
vm_paddr_t dmap_phys_base; /* The start of the dmap region */
/*
* Data for the pv entry allocation mechanism
*/
@ -446,18 +448,19 @@ pmap_early_vtophys(vm_offset_t l1pt, vm_offset_t va)
}
static void
pmap_bootstrap_dmap(vm_offset_t l1pt)
pmap_bootstrap_dmap(vm_offset_t l1pt, vm_paddr_t kernstart)
{
vm_offset_t va;
vm_paddr_t pa;
pd_entry_t *l1;
u_int l1_slot;
pa = dmap_phys_base = kernstart & ~L1_OFFSET;
va = DMAP_MIN_ADDRESS;
l1 = (pd_entry_t *)l1pt;
l1_slot = pmap_l1_index(DMAP_MIN_ADDRESS);
for (pa = 0; va < DMAP_MAX_ADDRESS;
for (; va < DMAP_MAX_ADDRESS;
pa += L1_SIZE, va += L1_SIZE, l1_slot++) {
KASSERT(l1_slot < Ln_ENTRIES, ("Invalid L1 index"));
@ -548,7 +551,8 @@ pmap_bootstrap(vm_offset_t l1pt, vm_paddr_t kernstart, vm_size_t kernlen)
pt_entry_t *l2;
vm_offset_t va, freemempos;
vm_offset_t dpcpu, msgbufpv;
vm_paddr_t pa;
vm_paddr_t pa, min_pa;
int i;
kern_delta = KERNBASE - kernstart;
physmem = 0;
@ -566,8 +570,23 @@ pmap_bootstrap(vm_offset_t l1pt, vm_paddr_t kernstart, vm_size_t kernlen)
*/
rw_init(&pvh_global_lock, "pmap pv global");
/* Assume the address we were loaded to is a valid physical address */
min_pa = KERNBASE - kern_delta;
/*
* Find the minimum physical address. physmap is sorted,
* but may contain empty ranges.
*/
for (i = 0; i < (physmap_idx * 2); i += 2) {
if (physmap[i] == physmap[i + 1])
continue;
if (physmap[i] <= min_pa)
min_pa = physmap[i];
break;
}
/* Create a direct map region early so we can use it for pa -> va */
pmap_bootstrap_dmap(l1pt);
pmap_bootstrap_dmap(l1pt, min_pa);
va = KERNBASE;
pa = KERNBASE - kern_delta;

12
sys/arm64/include/vmparam.h
View File

@ -160,11 +160,13 @@
#define DMAP_MIN_ADDRESS (0xffffffc000000000UL)
#define DMAP_MAX_ADDRESS (0xffffffdfffffffffUL)
#define DMAP_MIN_PHYSADDR (0x0000000000000000UL)
#define DMAP_MAX_PHYSADDR (DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS)
extern vm_paddr_t dmap_phys_base;
#define DMAP_MIN_PHYSADDR (dmap_phys_base)
#define DMAP_MAX_PHYSADDR (dmap_phys_base + (DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS))
/* True if pa is in the dmap range */
#define PHYS_IN_DMAP(pa) ((pa) <= DMAP_MAX_PHYSADDR)
#define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
(pa) <= DMAP_MAX_PHYSADDR)
/* True if va is in the dmap range */
#define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
(va) <= DMAP_MAX_ADDRESS)
@ -174,7 +176,7 @@
KASSERT(PHYS_IN_DMAP(pa), \
("%s: PA out of range, PA: 0x%lx", __func__, \
(vm_paddr_t)(pa))); \
(pa) | DMAP_MIN_ADDRESS; \
((pa) - dmap_phys_base) | DMAP_MIN_ADDRESS; \
})
#define DMAP_TO_PHYS(va) \
@ -182,7 +184,7 @@
KASSERT(VIRT_IN_DMAP(va), \
("%s: VA out of range, VA: 0x%lx", __func__, \
(vm_offset_t)(va))); \
(va) & ~DMAP_MIN_ADDRESS; \
((va) & ~DMAP_MIN_ADDRESS) + dmap_phys_base; \
})
#define VM_MIN_USER_ADDRESS (0x0000000000000000UL)