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| author | jah <jah@FreeBSD.org> | 2015-08-04 19:46:13 +0000 |
|---|---|---|
| committer | jah <jah@FreeBSD.org> | 2015-08-04 19:46:13 +0000 |
| commit | b8c4d76738c091ce972e522ec36c8dce6642f6fb (patch) | |
| tree | c099d6990763d6142f37775aa84b5193ad0b77fb /sys/powerpc/include | |
| parent | d6d829914b43c5cfe1482a423d5466cd717a330c (diff) | |
| download | FreeBSD-src-b8c4d76738c091ce972e522ec36c8dce6642f6fb.zip FreeBSD-src-b8c4d76738c091ce972e522ec36c8dce6642f6fb.tar.gz | |
Add two new pmap functions:
vm_offset_t pmap_quick_enter_page(vm_page_t m)
void pmap_quick_remove_page(vm_offset_t kva)
These will create and destroy a temporary, CPU-local KVA mapping of a specified page.
Guarantees:
--Will not sleep and will not fail.
--Safe to call under a non-sleepable lock or from an ithread
Restrictions:
--Not guaranteed to be safe to call from an interrupt filter or under a spin mutex on all platforms
--Current implementation does not guarantee more than one page of mapping space across all platforms. MI code should not make nested calls to pmap_quick_enter_page.
--MI code should not perform locking while holding onto a mapping created by pmap_quick_enter_page
The idea is to use this in busdma, for bounce buffer copies as well as virtually-indexed cache maintenance on mips and arm.
NOTE: the non-i386, non-amd64 implementations of these functions still need review and testing.
Reviewed by: kib
Approved by: kib (mentor)
Differential Revision: http://reviews.freebsd.org/D3013
Diffstat (limited to 'sys/powerpc/include')
| -rw-r--r-- | sys/powerpc/include/pcpu.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/sys/powerpc/include/pcpu.h b/sys/powerpc/include/pcpu.h index 79b2d96..2c79cd6 100644 --- a/sys/powerpc/include/pcpu.h +++ b/sys/powerpc/include/pcpu.h @@ -35,6 +35,7 @@ #include <machine/tlb.h> struct pmap; +struct pvo_entry; #define CPUSAVE_LEN 9 #define PCPU_MD_COMMON_FIELDS \ @@ -53,6 +54,9 @@ struct pmap; void *pc_restore; #define PCPU_MD_AIM32_FIELDS \ + vm_offset_t pc_qmap_addr; \ + struct pvo_entry *pc_qmap_pvo; \ + struct mtx pc_qmap_lock; \ /* char __pad[0] */ #define PCPU_MD_AIM64_FIELDS \ @@ -60,7 +64,10 @@ struct pmap; struct slb **pc_userslb; \ register_t pc_slbsave[18]; \ uint8_t pc_slbstack[1024]; \ - char __pad[1137] + vm_offset_t pc_qmap_addr; \ + struct pvo_entry *pc_qmap_pvo; \ + struct mtx pc_qmap_lock; \ + char __pad[1121 - sizeof(struct mtx)] #ifdef __powerpc64__ #define PCPU_MD_AIM_FIELDS PCPU_MD_AIM64_FIELDS @@ -78,9 +85,10 @@ struct pmap; register_t pc_booke_mchksave[CPUSAVE_LEN]; \ register_t pc_booke_tlbsave[BOOKE_TLBSAVE_LEN]; \ register_t pc_booke_tlb_level; \ + vm_offset_t pc_qmap_addr; \ uint32_t *pc_booke_tlb_lock; \ int pc_tid_next; \ - char __pad[173] + char __pad[165] /* Definitions for register offsets within the exception tmp save areas */ #define CPUSAVE_R27 0 /* where r27 gets saved */ |
