From ba4a86fba56ed62b596f87d43a6887cc9ca5906a Mon Sep 17 00:00:00 2001
From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Sun, 29 May 2005 15:54:26 +0000
Subject: add some fixes for v1 hardware (doesn't work reliably yet)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1100 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../patches/006-bcm47xx_workarounds.patch          | 108 +++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 target/linux/linux-2.4/patches/006-bcm47xx_workarounds.patch

(limited to 'target/linux/linux-2.4/patches/006-bcm47xx_workarounds.patch')

diff --git a/target/linux/linux-2.4/patches/006-bcm47xx_workarounds.patch b/target/linux/linux-2.4/patches/006-bcm47xx_workarounds.patch
new file mode 100644
index 000000000..6e52e9c72
--- /dev/null
+++ b/target/linux/linux-2.4/patches/006-bcm47xx_workarounds.patch
@@ -0,0 +1,108 @@
+diff -urN linux.old/arch/mips/mm/tlbex-mips32.S linux.dev/arch/mips/mm/tlbex-mips32.S
+--- linux.old/arch/mips/mm/tlbex-mips32.S	2005-05-28 17:42:03.000000000 +0200
++++ linux.dev/arch/mips/mm/tlbex-mips32.S	2005-05-28 21:48:55.000000000 +0200
+@@ -90,6 +90,9 @@
+ 	.set	noat
+ 	LEAF(except_vec0_r4000)
+ 	.set	mips3
++#ifdef CONFIG_BCM4704
++	nop
++#endif
+ #ifdef CONFIG_SMP
+ 	mfc0	k1, CP0_CONTEXT
+ 	la	k0, pgd_current
+diff -urN linux.old/arch/mips/mm/pg-r4k.c linux.dev/arch/mips/mm/pg-r4k.c
+--- linux.old/arch/mips/mm/pg-r4k.c	2005-01-19 15:09:29.000000000 +0100
++++ linux.dev/arch/mips/mm/pg-r4k.c	2005-05-28 21:57:52.000000000 +0200
+@@ -180,6 +180,7 @@
+ 
+ static inline void build_cdex_s(void)
+ {
++#if !defined(CONFIG_BCM4704) && !defined(CONFIG_BCM4710)
+ 	union mips_instruction mi;
+ 
+ 	if ((store_offset & (cpu_scache_line_size() - 1)))
+@@ -192,10 +193,12 @@
+ 	mi.c_format.simmediate = store_offset;
+ 
+ 	emit_instruction(mi);
++#endif
+ }
+ 
+ static inline void build_cdex_p(void)
+ {
++#if !defined(CONFIG_BCM4704) && !defined(CONFIG_BCM4710)
+ 	union mips_instruction mi;
+ 
+ 	if (store_offset & (cpu_dcache_line_size() - 1))
+@@ -218,6 +221,7 @@
+ 	mi.c_format.simmediate = store_offset;
+ 
+ 	emit_instruction(mi);
++#endif
+ }
+ 
+ static void __build_store_reg(int reg)
+diff -urN linux.old/include/asm-mips/stackframe.h linux.dev/include/asm-mips/stackframe.h
+--- linux.old/include/asm-mips/stackframe.h	2002-11-29 00:53:15.000000000 +0100
++++ linux.dev/include/asm-mips/stackframe.h	2005-05-28 21:53:03.000000000 +0200
+@@ -172,6 +172,46 @@
+ 		 rfe;					 \
+ 		.set	pop
+ 
++#elif defined(CONFIG_BCM4710) || defined(CONFIG_BCM4704)
++
++#define RESTORE_SOME                                     \
++		.set    push;                            \
++		.set    reorder;                         \
++		mfc0    t0, CP0_STATUS;                  \
++		.set    pop;                             \
++		ori     t0, 0x1f;                        \
++		xori    t0, 0x1f;                        \
++		mtc0    t0, CP0_STATUS;                  \
++		li      v1, 0xff00;                      \
++		and     t0, v1;                          \
++		lw      v0, PT_STATUS(sp);               \
++		nor     v1, $0, v1;                      \
++		and     v0, v1;                          \
++		or      v0, t0;                          \
++		ori     v1, v0, ST0_IE;                  \
++		xori    v1, v1, ST0_IE;                  \
++		mtc0    v1, CP0_STATUS;                  \
++		mtc0    v0, CP0_STATUS;                  \
++		lw      v1, PT_EPC(sp);                  \
++		mtc0    v1, CP0_EPC;                     \
++		lw      $31, PT_R31(sp);                 \
++		lw      $28, PT_R28(sp);                 \
++		lw      $25, PT_R25(sp);                 \
++		lw      $7,  PT_R7(sp);                  \
++		lw      $6,  PT_R6(sp);                  \
++		lw      $5,  PT_R5(sp);                  \
++		lw      $4,  PT_R4(sp);                  \
++		lw      $3,  PT_R3(sp);                  \
++		lw      $2,  PT_R2(sp)
++
++#define RESTORE_SP_AND_RET                               \
++		lw      sp,  PT_R29(sp);                 \
++		nop;                                     \
++		nop;                                     \
++		.set    mips3;                           \
++		eret;                                    \
++		.set    mips0
++
+ #else
+ 
+ #define RESTORE_SOME                                     \
+diff -urN linux.old/arch/mips/mm/tlbex-r4k.S linux.dev/arch/mips/mm/tlbex-r4k.S
+--- linux.old/arch/mips/mm/tlbex-r4k.S	2005-05-28 17:42:03.000000000 +0200
++++ linux.dev/arch/mips/mm/tlbex-r4k.S	2005-05-29 15:04:43.000000000 +0200
+@@ -168,6 +168,9 @@
+ 	.set	noat
+ 	LEAF(except_vec0_r4000)
+ 	.set	mips3
++#ifdef CONFIG_BCM4704
++	nop
++#endif
+ 	GET_PGD(k0, k1)				# get pgd pointer
+ 	mfc0	k0, CP0_BADVADDR		# Get faulting address
+ 	srl	k0, k0, _PGDIR_SHIFT		# get pgd only bits
-- 
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