[PARISC] Make sure use of RFI conforms to PA 2.0 and 1.1 arch docs
2.6.12-rc4-pa3 : first pass at making sure use of RFI conforms to
PA 2.0 arch pages F-4 and F-5, PA 1.1 Arch page 3-19 and 3-20.
The discussion revolves around all the rules for clearing PSW Q-bit.
The hard part is meeting all the rules for "relied upon translation".
.align directive is used to guarantee the critical sequence ends more than
8 instructions (32 bytes) from the end of page.
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
diff --git a/include/asm-parisc/assembly.h b/include/asm-parisc/assembly.h
index 30b0234..b24a99e 100644
--- a/include/asm-parisc/assembly.h
+++ b/include/asm-parisc/assembly.h
@@ -450,5 +450,30 @@
REST_CR (%cr22, PT_PSW (\regs))
.endm
+
+ /* First step to create a "relied upon translation"
+ * See PA 2.0 Arch. page F-4 and F-5.
+ *
+ * The ssm was originally necessary due to a "PCxT bug".
+ * But someone decided it needed to be added to the architecture
+ * and this "feature" went into rev3 of PA-RISC 1.1 Arch Manual.
+ * It's been carried forward into PA 2.0 Arch as well. :^(
+ *
+ * "ssm 0,%r0" is a NOP with side effects (prefetch barrier).
+ * rsm/ssm prevents the ifetch unit from speculatively fetching
+ * instructions past this line in the code stream.
+ * PA 2.0 processor will single step all insn in the same QUAD (4 insn).
+ */
+ .macro pcxt_ssm_bug
+ rsm PSW_SM_I,%r0
+ nop /* 1 */
+ nop /* 2 */
+ nop /* 3 */
+ nop /* 4 */
+ nop /* 5 */
+ nop /* 6 */
+ nop /* 7 */
+ .endm
+
#endif /* __ASSEMBLY__ */
#endif
diff --git a/include/asm-parisc/psw.h b/include/asm-parisc/psw.h
index 5132302..4334d6c 100644
--- a/include/asm-parisc/psw.h
+++ b/include/asm-parisc/psw.h
@@ -1,4 +1,7 @@
#ifndef _PARISC_PSW_H
+
+#include <linux/config.h>
+
#define PSW_I 0x00000001
#define PSW_D 0x00000002
#define PSW_P 0x00000004
@@ -9,6 +12,16 @@
#define PSW_G 0x00000040 /* PA1.x only */
#define PSW_O 0x00000080 /* PA2.0 only */
+/* ssm/rsm instructions number PSW_W and PSW_E differently */
+#define PSW_SM_I PSW_I /* Enable External Interrupts */
+#define PSW_SM_D PSW_D
+#define PSW_SM_P PSW_P
+#define PSW_SM_Q PSW_Q /* Enable Interrupt State Collection */
+#define PSW_SM_R PSW_R /* Enable Recover Counter Trap */
+#define PSW_SM_W 0x200 /* PA2.0 only : Enable Wide Mode */
+
+#define PSW_SM_QUIET PSW_SM_R+PSW_SM_Q+PSW_SM_P+PSW_SM_D+PSW_SM_I
+
#define PSW_CB 0x0000ff00
#define PSW_M 0x00010000
@@ -30,33 +43,21 @@
#define PSW_Z 0x40000000 /* PA1.x only */
#define PSW_Y 0x80000000 /* PA1.x only */
-#ifdef __LP64__
-#define PSW_HI_CB 0x000000ff /* PA2.0 only */
+#ifdef CONFIG_64BIT
+# define PSW_HI_CB 0x000000ff /* PA2.0 only */
#endif
-/* PSW bits to be used with ssm/rsm */
-#define PSW_SM_I 0x1
-#define PSW_SM_D 0x2
-#define PSW_SM_P 0x4
-#define PSW_SM_Q 0x8
-#define PSW_SM_R 0x10
-#define PSW_SM_F 0x20
-#define PSW_SM_G 0x40
-#define PSW_SM_O 0x80
-#define PSW_SM_E 0x100
-#define PSW_SM_W 0x200
-
-#ifdef __LP64__
-# define USER_PSW (PSW_C | PSW_Q | PSW_P | PSW_D | PSW_I)
-# define KERNEL_PSW (PSW_W | PSW_C | PSW_Q | PSW_P | PSW_D)
-# define REAL_MODE_PSW (PSW_W | PSW_Q)
-# define USER_PSW_MASK (PSW_W | PSW_T | PSW_N | PSW_X | PSW_B | PSW_V | PSW_CB)
-# define USER_PSW_HI_MASK (PSW_HI_CB)
-#else
-# define USER_PSW (PSW_C | PSW_Q | PSW_P | PSW_D | PSW_I)
-# define KERNEL_PSW (PSW_C | PSW_Q | PSW_P | PSW_D)
-# define REAL_MODE_PSW (PSW_Q)
-# define USER_PSW_MASK (PSW_T | PSW_N | PSW_X | PSW_B | PSW_V | PSW_CB)
+#ifdef CONFIG_64BIT
+# define USER_PSW_HI_MASK PSW_HI_CB
+# define WIDE_PSW PSW_W
+#else
+# define WIDE_PSW 0
#endif
+/* Used when setting up for rfi */
+#define KERNEL_PSW (WIDE_PSW | PSW_C | PSW_Q | PSW_P | PSW_D)
+#define REAL_MODE_PSW (WIDE_PSW | PSW_Q)
+#define USER_PSW_MASK (WIDE_PSW | PSW_T | PSW_N | PSW_X | PSW_B | PSW_V | PSW_CB)
+#define USER_PSW (PSW_C | PSW_Q | PSW_P | PSW_D | PSW_I)
+
#endif
diff --git a/include/asm-parisc/tlbflush.h b/include/asm-parisc/tlbflush.h
index eb27b78..efbb2d8 100644
--- a/include/asm-parisc/tlbflush.h
+++ b/include/asm-parisc/tlbflush.h
@@ -64,29 +64,26 @@
{
unsigned long npages;
-
npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- if (npages >= 512) /* XXX arbitrary, should be tuned */
+ if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */
flush_tlb_all();
else {
mtsp(vma->vm_mm->context,1);
+ purge_tlb_start();
if (split_tlb) {
- purge_tlb_start();
while (npages--) {
pdtlb(start);
pitlb(start);
start += PAGE_SIZE;
}
- purge_tlb_end();
} else {
- purge_tlb_start();
while (npages--) {
pdtlb(start);
start += PAGE_SIZE;
}
- purge_tlb_end();
}
+ purge_tlb_end();
}
}
