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authorChris Zankel <chris@zankel.net>2007-08-06 23:57:57 -0700
committerChris Zankel <chris@zankel.net>2007-08-27 13:54:01 -0700
commit01858d1b0b406307626bbc01238391b06aae2c20 (patch)
treed01d20f3f513e6a21880a60cdf195023e6aafc66 /arch
parent26465f2f4f5a253f22596fc9245a6bb5c0856ee1 (diff)
downloadop-kernel-dev-01858d1b0b406307626bbc01238391b06aae2c20.zip
op-kernel-dev-01858d1b0b406307626bbc01238391b06aae2c20.tar.gz
[XTENSA] Add support for executable/non-executable feature in the mmu
Newer processor versions starting with Xtensa6/LX2 support an 'executable' bit for memory pages. This bit replaces the 'valid' bit, so it must be always set to one for older processor versions. To mark a page invalid, we now set the cache-attributes to b11, which is backward compatible. Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch')
-rw-r--r--arch/xtensa/kernel/entry.S42
1 files changed, 28 insertions, 14 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 8dc7a2c..65741e3 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -1572,10 +1572,12 @@ ENTRY(fast_second_level_miss)
l32i a0, a1, TASK_MM # tsk->mm
beqz a0, 9f
-8: rsr a1, EXCVADDR # fault address
- _PGD_OFFSET(a0, a1, a1)
+
+ /* We deliberately destroy a3 that holds the exception table. */
+
+8: rsr a3, EXCVADDR # fault address
+ _PGD_OFFSET(a0, a3, a1)
l32i a0, a0, 0 # read pmdval
- //beqi a0, _PAGE_USER, 2f
beqz a0, 2f
/* Read ptevaddr and convert to top of page-table page.
@@ -1596,20 +1598,34 @@ ENTRY(fast_second_level_miss)
extui a1, a0, 0, PAGE_SHIFT # ... & PAGE_MASK
xor a0, a0, a1
-
- movi a1, PAGE_DIRECTORY
+ movi a1, _PAGE_DIRECTORY
or a0, a0, a1 # ... | PAGE_DIRECTORY
+ /*
+ * We utilize all three wired-ways (7-9( to hold pmd translations.
+ * Memory regions are mapped to the DTLBs according to bits 28 and 29.
+ * This allows to map the three most common regions to three different
+ * DTLBs:
+ * 0,1 -> way 7 program (0040.0000) and virtual (c000.0000)
+ * 2 -> way 8 shared libaries (2000.0000)
+ * 3 -> way 0 stack (3000.0000)
+ */
+
+ extui a3, a3, 28, 2 # addr. bit 28 and 29 0,1,2,3
rsr a1, PTEVADDR
+ addx2 a3, a3, a3 # -> 0,3,6,9
srli a1, a1, PAGE_SHIFT
+ extui a3, a3, 2, 2 # -> 0,0,1,2
slli a1, a1, PAGE_SHIFT # ptevaddr & PAGE_MASK
- addi a1, a1, DTLB_WAY_PGD # ... + way_number
+ addi a3, a3, DTLB_WAY_PGD
+ add a1, a1, a3 # ... + way_number
- wdtlb a0, a1
+3: wdtlb a0, a1
dsync
/* Exit critical section. */
+4: movi a3, exc_table # restore a3
movi a0, 0
s32i a0, a3, EXC_TABLE_FIXUP
@@ -1638,6 +1654,7 @@ ENTRY(fast_second_level_miss)
2: /* Invalid PGD, default exception handling */
+ movi a3, exc_table
rsr a1, DEPC
xsr a3, EXCSAVE_1
s32i a1, a2, PT_AREG2
@@ -1682,15 +1699,15 @@ ENTRY(fast_store_prohibited)
8: rsr a1, EXCVADDR # fault address
_PGD_OFFSET(a0, a1, a4)
l32i a0, a0, 0
- //beqi a0, _PAGE_USER, 2f # FIXME use _PAGE_INVALID
beqz a0, 2f
+ /* Note that we assume _PAGE_WRITABLE_BIT is only set if pte is valid.*/
+
_PTE_OFFSET(a0, a1, a4)
l32i a4, a0, 0 # read pteval
- movi a1, _PAGE_VALID | _PAGE_RW
- bnall a4, a1, 2f
+ bbci.l a4, _PAGE_WRITABLE_BIT, 2f
- movi a1, _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_WRENABLE
+ movi a1, _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HW_WRITE
or a4, a4, a1
rsr a1, EXCVADDR
s32i a4, a0, 0
@@ -1700,10 +1717,7 @@ ENTRY(fast_store_prohibited)
dhwb a0, 0
#endif
pdtlb a0, a1
- beqz a0, 1f
- idtlb a0 // FIXME do we need this?
wdtlb a4, a0
-1:
/* Exit critical section. */
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