Fix 64bit SMP TLB handler and stack frame handling, optimize 32bit SMP

TLB handlers a bit, match definitions in pgtable-{32,64}.h better.
Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/head.S

@@ -157,6 +157,7 @@ NESTED(kernel_entry, 16, sp)			# kernel entry point
 	LONG_S		a2, fw_arg2
 	LONG_S		a3, fw_arg3
 
+	MTC0		zero, CP0_CONTEXT	# clear context register
 	PTR_LA		$28, init_thread_union
 	PTR_ADDIU	sp, $28, _THREAD_SIZE - 32
 	set_saved_sp	sp, t0, t1

arch/mips/mm/tlbex.c

@@ -91,7 +91,7 @@ enum opcode {
 	insn_addu, insn_addiu, insn_and, insn_andi, insn_beq,
 	insn_beql, insn_bgez, insn_bgezl, insn_bltz, insn_bltzl,
 	insn_bne, insn_daddu, insn_daddiu, insn_dmfc0, insn_dmtc0,
-	insn_dsll, insn_dsll32, insn_dsra, insn_dsrl, insn_dsrl32,
+	insn_dsll, insn_dsll32, insn_dsra, insn_dsrl,
 	insn_dsubu, insn_eret, insn_j, insn_jal, insn_jr, insn_ld,
 	insn_ll, insn_lld, insn_lui, insn_lw, insn_mfc0, insn_mtc0,
 	insn_ori, insn_rfe, insn_sc, insn_scd, insn_sd, insn_sll,
@@ -134,7 +134,6 @@ static __initdata struct insn insn_table[] = {
 	{ insn_dsll32, M(spec_op,0,0,0,0,dsll32_op), RT | RD | RE },
 	{ insn_dsra, M(spec_op,0,0,0,0,dsra_op), RT | RD | RE },
 	{ insn_dsrl, M(spec_op,0,0,0,0,dsrl_op), RT | RD | RE },
-	{ insn_dsrl32, M(spec_op,0,0,0,0,dsrl32_op), RT | RD | RE },
 	{ insn_dsubu, M(spec_op,0,0,0,0,dsubu_op), RS | RT | RD },
 	{ insn_eret, M(cop0_op,cop_op,0,0,0,eret_op), 0 },
 	{ insn_j, M(j_op,0,0,0,0,0), JIMM },
@@ -366,7 +365,6 @@ I_u2u1u3(_dsll);
 I_u2u1u3(_dsll32);
 I_u2u1u3(_dsra);
 I_u2u1u3(_dsrl);
-I_u2u1u3(_dsrl32);
 I_u3u1u2(_dsubu);
 I_0(_eret);
 I_u1(_j);
@@ -944,34 +942,29 @@ build_get_pmde64(u32 **p, struct label **l, struct reloc **r,
 	/* No i_nop needed here, since the next insn doesn't touch TMP. */
 
 #ifdef CONFIG_SMP
+# ifdef CONFIG_BUILD_ELF64
 	/*
-	 * 64 bit SMP has the lower part of &pgd_current[smp_processor_id()]
+	 * 64 bit SMP running in XKPHYS has smp_processor_id() << 3
 	 * stored in CONTEXT.
 	 */
-	if (in_compat_space_p(pgdc)) {
-		i_dmfc0(p, ptr, C0_CONTEXT);
-		i_dsra(p, ptr, ptr, 23);
-		i_ld(p, ptr, 0, ptr);
-	} else {
-#ifdef CONFIG_BUILD_ELF64
-		i_dmfc0(p, ptr, C0_CONTEXT);
-		i_dsrl(p, ptr, ptr, 23);
-		i_dsll(p, ptr, ptr, 3);
-		i_LA_mostly(p, tmp, pgdc);
-		i_daddu(p, ptr, ptr, tmp);
-		i_dmfc0(p, tmp, C0_BADVADDR);
-		i_ld(p, ptr, rel_lo(pgdc), ptr);
-#else
-		i_dmfc0(p, ptr, C0_CONTEXT);
-		i_lui(p, tmp, rel_highest(pgdc));
-		i_dsll(p, ptr, ptr, 9);
-		i_daddiu(p, tmp, tmp, rel_higher(pgdc));
-		i_dsrl32(p, ptr, ptr, 0);
-		i_and(p, ptr, ptr, tmp);
-		i_dmfc0(p, tmp, C0_BADVADDR);
-		i_ld(p, ptr, 0, ptr);
-#endif
-	}
+	i_dmfc0(p, ptr, C0_CONTEXT);
+	i_dsrl(p, ptr, ptr, 23);
+	i_LA_mostly(p, tmp, pgdc);
+	i_daddu(p, ptr, ptr, tmp);
+	i_dmfc0(p, tmp, C0_BADVADDR);
+	i_ld(p, ptr, rel_lo(pgdc), ptr);
+# else
+	/*
+	 * 64 bit SMP running in compat space has the lower part of
+	 * &pgd_current[smp_processor_id()] stored in CONTEXT.
+	 */
+	if (!in_compat_space_p(pgdc))
+		panic("Invalid page directory address!");
+
+	i_dmfc0(p, ptr, C0_CONTEXT);
+	i_dsra(p, ptr, ptr, 23);
+	i_ld(p, ptr, 0, ptr);
+# endif
 #else
 	i_LA_mostly(p, ptr, pgdc);
 	i_ld(p, ptr, rel_lo(pgdc), ptr);
@@ -1028,7 +1021,6 @@ build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
 	i_mfc0(p, ptr, C0_CONTEXT);
 	i_LA_mostly(p, tmp, pgdc);
 	i_srl(p, ptr, ptr, 23);
-	i_sll(p, ptr, ptr, 2);
 	i_addu(p, ptr, tmp, ptr);
 #else
 	i_LA_mostly(p, ptr, pgdc);

include/asm-mips/mmu_context.h

@@ -30,7 +30,7 @@ extern unsigned long pgd_current[];
 
 #ifdef CONFIG_32BIT
 #define TLBMISS_HANDLER_SETUP()						\
-	write_c0_context((unsigned long) smp_processor_id() << 23);	\
+	write_c0_context((unsigned long) smp_processor_id() << 25);	\
 	TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir)
 #endif
 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
@@ -40,7 +40,7 @@ extern unsigned long pgd_current[];
 #endif
 #if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
 #define TLBMISS_HANDLER_SETUP()						\
-	write_c0_context((unsigned long) smp_processor_id() << 23);	\
+	write_c0_context((unsigned long) smp_processor_id() << 26);	\
 	TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir)
 #endif
 

include/asm-mips/pgtable-64.h

@@ -114,7 +114,7 @@ extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
 extern pmd_t empty_bad_pmd_table[PTRS_PER_PMD];
 
 /*
- * Empty pmd entries point to the invalid_pte_table.
+ * Empty pgd/pmd entries point to the invalid_pte_table.
  */
 static inline int pmd_none(pmd_t pmd)
 {
@@ -156,7 +156,8 @@ static inline void pud_clear(pud_t *pudp)
 	pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
 }
 
-#define pte_page(x)		pfn_to_page((unsigned long)((pte_val(x) >> PAGE_SHIFT)))
+#define pte_page(x)		pfn_to_page(pte_pfn(x))
+
 #ifdef CONFIG_CPU_VR41XX
 #define pte_pfn(x)		((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
 #define pfn_pte(pfn, prot)	__pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
@@ -167,12 +168,14 @@ static inline void pud_clear(pud_t *pudp)
 
 #define __pgd_offset(address)	pgd_index(address)
 #define __pud_offset(address)	(((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
+#define __pmd_offset(address)	pmd_index(address)
 #define page_pte(page) page_pte_prot(page, __pgprot(0))
 
 /* to find an entry in a kernel page-table-directory */
 #define pgd_offset_k(address) pgd_offset(&init_mm, 0)
 
 #define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define pmd_index(address)	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 
 /* to find an entry in a page-table-directory */
 #define pgd_offset(mm,addr)	((mm)->pgd + pgd_index(addr))
@@ -185,8 +188,7 @@ static inline unsigned long pud_page(pud_t pud)
 /* Find an entry in the second-level page table.. */
 static inline pmd_t *pmd_offset(pud_t * pud, unsigned long address)
 {
-	return (pmd_t *) pud_page(*pud) +
-	       ((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
+	return (pmd_t *) pud_page(*pud) + pmd_index(address);
 }
 
 /* Find an entry in the third-level page table.. */

include/asm-mips/stackframe.h

@@ -60,7 +60,6 @@
 		mfc0	k0, CP0_CONTEXT
 		lui	k1, %hi(kernelsp)
 		srl	k0, k0, 23
-		sll	k0, k0, 2
 		addu	k1, k0
 		LONG_L	k1, %lo(kernelsp)(k1)
 #endif
@@ -76,12 +75,12 @@
 #endif
 #if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
 		MFC0	k1, CP0_CONTEXT
-		dsrl	k1, 23
-		dsll	k1, k1, 3
 		lui	k0, %highest(kernelsp)
+		dsrl	k1, 23
 		daddiu	k0, %higher(kernelsp)
 		dsll	k0, k0, 16
 		daddiu	k0, %hi(kernelsp)
+		dsll	k0, k0, 16
 		daddu	k1, k1, k0
 		LONG_L	k1, %lo(kernelsp)(k1)
 #endif
@@ -91,7 +90,6 @@
 #ifdef CONFIG_32BIT
 		mfc0	\temp, CP0_CONTEXT
 		srl	\temp, 23
-		sll	\temp, 2
 		LONG_S	\stackp, kernelsp(\temp)
 #endif
 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
@@ -102,8 +100,8 @@
 		LONG_S	\stackp, %lo(kernelsp)(\temp)
 #endif
 #if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
-		lw	\temp, TI_CPU(gp)
-		dsll	\temp, 3
+		MFC0	\temp, CP0_CONTEXT
+		dsrl	\temp, 23
 		LONG_S	\stackp, kernelsp(\temp)
 #endif
 		.endm