This must be the oldest bug that we have got. Leaving interrupts "as they are" for the R3000 obviously means copying IEp to IEc. Since we have got STATMASK now, I took this opportunity to mask the status register "correctly" for the R3000 now too. Oh, and the R3000 hardly ever is 64-bit. Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx> --- The KMODE change is important, the others -- not so much, but I have thought there is not much point in separating these into three patches -- they are just too trivial. Call them "R3000 fixes for <asm/stackframe.h>" if you like instead. Please apply. Maciej patch-mips-2.6.18-20060920-r3000-kmode-2 diff -up --recursive --new-file linux-mips-2.6.18-20060920.macro/include/asm-mips/stackframe.h linux-mips-2.6.18-20060920/include/asm-mips/stackframe.h --- linux-mips-2.6.18-20060920.macro/include/asm-mips/stackframe.h 2006-06-22 05:11:41.000000000 +0000 +++ linux-mips-2.6.18-20060920/include/asm-mips/stackframe.h 2007-05-21 00:03:57.000000000 +0000 @@ -17,6 +17,18 @@ #include <asm/mipsregs.h> #include <asm/asm-offsets.h> +/* + * For SMTC kernel, global IE should be left set, and interrupts + * controlled exclusively via IXMT. + */ +#ifdef CONFIG_MIPS_MT_SMTC +#define STATMASK 0x1e +#elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) +#define STATMASK 0x3f +#else +#define STATMASK 0x1f +#endif + #ifdef CONFIG_MIPS_MT_SMTC #include <asm/mipsmtregs.h> #endif /* CONFIG_MIPS_MT_SMTC */ @@ -244,10 +256,10 @@ .set reorder .set noat mfc0 a0, CP0_STATUS - ori a0, 0x1f - xori a0, 0x1f - mtc0 a0, CP0_STATUS li v1, 0xff00 + ori a0, STATMASK + xori a0, STATMASK + mtc0 a0, CP0_STATUS and a0, v1 LONG_L v0, PT_STATUS(sp) nor v1, $0, v1 @@ -257,10 +269,6 @@ LONG_L $31, PT_R31(sp) LONG_L $28, PT_R28(sp) LONG_L $25, PT_R25(sp) -#ifdef CONFIG_64BIT - LONG_L $8, PT_R8(sp) - LONG_L $9, PT_R9(sp) -#endif LONG_L $7, PT_R7(sp) LONG_L $6, PT_R6(sp) LONG_L $5, PT_R5(sp) @@ -281,16 +289,6 @@ .endm #else -/* - * For SMTC kernel, global IE should be left set, and interrupts - * controlled exclusively via IXMT. - */ - -#ifdef CONFIG_MIPS_MT_SMTC -#define STATMASK 0x1e -#else -#define STATMASK 0x1f -#endif .macro RESTORE_SOME .set push .set reorder @@ -393,9 +391,9 @@ .macro CLI #if !defined(CONFIG_MIPS_MT_SMTC) mfc0 t0, CP0_STATUS - li t1, ST0_CU0 | 0x1f + li t1, ST0_CU0 | STATMASK or t0, t1 - xori t0, 0x1f + xori t0, STATMASK mtc0 t0, CP0_STATUS #else /* CONFIG_MIPS_MT_SMTC */ /* @@ -428,9 +426,9 @@ .macro STI #if !defined(CONFIG_MIPS_MT_SMTC) mfc0 t0, CP0_STATUS - li t1, ST0_CU0 | 0x1f + li t1, ST0_CU0 | STATMASK or t0, t1 - xori t0, 0x1e + xori t0, STATMASK & ~1 mtc0 t0, CP0_STATUS #else /* CONFIG_MIPS_MT_SMTC */ /* @@ -459,7 +457,8 @@ .endm /* - * Just move to kernel mode and leave interrupts as they are. + * Just move to kernel mode and leave interrupts as they are. Note + * for the R3000 this means copying the previous enable from IEp. * Set cp0 enable bit as sign that we're running on the kernel stack */ .macro KMODE @@ -490,9 +489,14 @@ move ra, t0 #endif /* CONFIG_MIPS_MT_SMTC */ mfc0 t0, CP0_STATUS - li t1, ST0_CU0 | 0x1e + li t1, ST0_CU0 | (STATMASK & ~1) +#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) + andi t2, t0, ST0_IEP + srl t2, 2 + or t0, t2 +#endif or t0, t1 - xori t0, 0x1e + xori t0, STATMASK & ~1 mtc0 t0, CP0_STATUS #ifdef CONFIG_MIPS_MT_SMTC _ehb
