---

yaml
---
r: 10474
b: refs/heads/master
c: 896a375
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b2c1fe81df7471de9f7e2918877ac04ec9cde35f
+refs/heads/master: 896a375623c3643a3f189353e7d4828c48a7fdf8

trunk/arch/parisc/kernel/entry.S

@@ -30,9 +30,9 @@
  *  - save registers to kernel stack and handle in assembly or C */
 
 
+#include <asm/psw.h>
 #include <asm/assembly.h>	/* for LDREG/STREG defines */
 #include <asm/pgtable.h>
-#include <asm/psw.h>
 #include <asm/signal.h>
 #include <asm/unistd.h>
 #include <asm/thread_info.h>
@@ -67,19 +67,22 @@
 
 	/* Switch to virtual mapping, trashing only %r1 */
 	.macro  virt_map
-	rsm     PSW_SM_Q,%r0
-	tovirt_r1 %r29
-	mfsp	%sr7, %r1
-	or,=    %r0,%r1,%r0 /* Only save sr7 in sr3 if sr7 != 0 */
-	mtsp	%r1, %sr3
+	/* pcxt_ssm_bug */
+	rsm	PSW_SM_I, %r0	/* barrier for "Relied upon Translation */
 	mtsp	%r0, %sr4
 	mtsp	%r0, %sr5
+	mfsp	%sr7, %r1
+	or,=    %r0,%r1,%r0	/* Only save sr7 in sr3 if sr7 != 0 */
+	mtsp	%r1, %sr3
+	tovirt_r1 %r29
+	load32	KERNEL_PSW, %r1
+
+	rsm     PSW_SM_QUIET,%r0	/* second "heavy weight" ctl op */
 	mtsp	%r0, %sr6
 	mtsp	%r0, %sr7
-	load32	KERNEL_PSW, %r1
-	mtctl	%r1, %cr22
 	mtctl	%r0, %cr17	/* Clear IIASQ tail */
 	mtctl	%r0, %cr17	/* Clear IIASQ head */
+	mtctl	%r1, %ipsw
 	load32	4f, %r1
 	mtctl	%r1, %cr18	/* Set IIAOQ tail */
 	ldo	4(%r1), %r1
@@ -888,9 +891,6 @@ _switch_to_ret:
 	 * this way, then we will need to copy %sr3 in to PT_SR[3..7], and
 	 * adjust IASQ[0..1].
 	 *
-	 * Note that the following code uses a "relied upon translation".
-	 * See the parisc ACD for details. The ssm is necessary due to a
-	 * PCXT bug.
 	 */
 
 	.align 4096
@@ -985,24 +985,19 @@ intr_restore:
 	rest_fp         %r1
 	rest_general    %r29
 
-	/* Create a "relied upon translation" PA 2.0 Arch. F-5 */
-	ssm		0,%r0
-	nop
-	nop
-	nop
-	nop
-	nop
-	nop
-	nop
+	/* inverse of virt_map */
+	pcxt_ssm_bug
+	rsm             PSW_SM_QUIET,%r0	/* prepare for rfi */
 	tophys_r1       %r29
-	rsm             (PSW_SM_Q|PSW_SM_P|PSW_SM_D|PSW_SM_I),%r0
 
 	/* Restore space id's and special cr's from PT_REGS
-	 * structure pointed to by r29 */
+	 * structure pointed to by r29
+	 */
 	rest_specials	%r29
 
-	/* Important: Note that rest_stack restores r29
-	 * last (we are using it)! It also restores r1 and r30. */
+	/* IMPORTANT: rest_stack restores r29 last (we are using it)!
+	 * It also restores r1 and r30.
+	 */
 	rest_stack
 
 	rfi
@@ -1153,15 +1148,17 @@ intr_save:
 
 	CMPIB=,n        6,%r26,skip_save_ior
 
-	/* save_specials left ipsw value in r8 for us to test */
 
 	mfctl           %cr20, %r16 /* isr */
+	nop		/* serialize mfctl on PA 2.0 to avoid 4 cycle penalty */
 	mfctl           %cr21, %r17 /* ior */
 
+
 #ifdef __LP64__
 	/*
 	 * If the interrupted code was running with W bit off (32 bit),
 	 * clear the b bits (bits 0 & 1) in the ior.
+	 * save_specials left ipsw value in r8 for us to test.
 	 */
 	extrd,u,*<>     %r8,PSW_W_BIT,1,%r0
 	depdi           0,1,2,%r17
@@ -1487,10 +1484,10 @@ nadtlb_emulate:
 	add,l           %r1,%r24,%r1           /* doesn't affect c/b bits */
 
 nadtlb_nullify:
-	mfctl           %cr22,%r8              /* Get ipsw */
+	mfctl           %ipsw,%r8
 	ldil            L%PSW_N,%r9
 	or              %r8,%r9,%r8            /* Set PSW_N */
-	mtctl           %r8,%cr22
+	mtctl           %r8,%ipsw
 
 	rfir
 	nop

trunk/arch/parisc/kernel/head.S

@@ -224,8 +224,6 @@ stext_pdc_ret:
 	mtctl	%r0,%cr12
 	mtctl	%r0,%cr13
 
-	/* Prepare to RFI! Man all the cannons! */
-
 	/* Initialize the global data pointer */
 	loadgp
 
@@ -254,55 +252,28 @@ $is_pa20:
 $install_iva:
 	mtctl		%r10,%cr14
 
-#ifdef __LP64__
-	b		aligned_rfi
+	b		aligned_rfi  /* Prepare to RFI! Man all the cannons! */
 	nop
 
-	.align          256
+	.align 128
 aligned_rfi:
-	ssm             0,0
-	nop             /* 1 */
-	nop             /* 2 */
-	nop             /* 3 */
-	nop             /* 4 */
-	nop             /* 5 */
-	nop             /* 6 */
-	nop             /* 7 */
-	nop             /* 8 */
-#endif
-
-#ifdef __LP64__ /* move to psw.h? */
-#define		PSW_BITS	PSW_Q+PSW_I+PSW_D+PSW_P+PSW_R
-#else
-#define		PSW_BITS	PSW_SM_Q
-#endif
-
-$rfi:	
-	/* turn off troublesome PSW bits */
-	rsm		PSW_BITS,%r0
+	pcxt_ssm_bug
 
-	/* kernel PSW:
-	 *  - no interruptions except HPMC and TOC (which are handled by PDC)
-	 *  - Q bit set (IODC / PDC interruptions)
-	 *  - big-endian
-	 *  - virtually mapped
-	 */
-	load32		KERNEL_PSW,%r10
-	mtctl		%r10,%ipsw
+	rsm		PSW_SM_QUIET,%r0	/* off troublesome PSW bits */
+	/* Don't need NOPs, have 8 compliant insn before rfi */
 
-	/* Set the space pointers for the post-RFI world
-	** Clear the two-level IIA Space Queue, effectively setting
-	** Kernel space.
-	*/
 	mtctl		%r0,%cr17	/* Clear IIASQ tail */
 	mtctl		%r0,%cr17	/* Clear IIASQ head */
 
 	/* Load RFI target into PC queue */
 	mtctl		%r11,%cr18	/* IIAOQ head */
 	ldo		4(%r11),%r11
 	mtctl		%r11,%cr18	/* IIAOQ tail */
+
+	load32		KERNEL_PSW,%r10
+	mtctl		%r10,%ipsw
 
-	/* Jump to hyperspace */
+	/* Jump through hyperspace to Virt Mode */
 	rfi
 	nop