[MIPS] 16K & 64K page size fixes

Derived from Peter Watkins <treestem@gmail.com>'s work.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

8 files changed, 60 insertions, 11 deletions

diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index e9ce5b3721a..ff88b06f89d 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -22,7 +22,7 @@
 #define offset(string, ptr, member) \
 	__asm__("\n@@@" string "%0" : : "i" (_offset(ptr, member)))
 #define constant(string, member) \
-	__asm__("\n@@@" string "%x0" : : "ri" (member))
+	__asm__("\n@@@" string "%X0" : : "ri" (member))
 #define size(string, size) \
 	__asm__("\n@@@" string "%0" : : "i" (sizeof(size)))
 #define linefeed text("")
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 8c6db0fc72f..ddc1b71c937 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -189,7 +189,8 @@ NESTED(kernel_entry, 16, sp)			# kernel entry point
 
 	MTC0		zero, CP0_CONTEXT	# clear context register
 	PTR_LA		$28, init_thread_union
-	PTR_ADDIU	sp, $28, _THREAD_SIZE - 32
+	PTR_LI		sp, _THREAD_SIZE - 32
+	PTR_ADDU	sp, $28
 	set_saved_sp	sp, t0, t1
 	PTR_SUBU	sp, 4 * SZREG		# init stack pointer
 
diff --git a/arch/mips/kernel/r4k_switch.S b/arch/mips/kernel/r4k_switch.S
index d5c8b82fed7..cc566cf1224 100644
--- a/arch/mips/kernel/r4k_switch.S
+++ b/arch/mips/kernel/r4k_switch.S
@@ -85,7 +85,12 @@
 	move	$28, a2
 	cpu_restore_nonscratch a1
 
+#if (_THREAD_SIZE - 32) < 0x10000
 	PTR_ADDIU	t0, $28, _THREAD_SIZE - 32
+#else
+	PTR_LI		t0, _THREAD_SIZE - 32
+	PTR_ADDU	t0, $28
+#endif
 	set_saved_sp	t0, t1, t2
 #ifdef CONFIG_MIPS_MT_SMTC
 	/* Read-modify-writes of Status must be atomic on a VPE */
diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
index 25ed3337ce3..79f0317d84a 100644
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -50,6 +50,16 @@ SECTIONS
   /* writeable */
   .data : {			/* Data */
     . = . + DATAOFFSET;		/* for CONFIG_MAPPED_KERNEL */
+    /*
+     * This ALIGN is needed as a workaround for a bug a gcc bug upto 4.1 which
+     * limits the maximum alignment to at most 32kB and results in the following
+     * warning:
+     *
+     *  CC      arch/mips/kernel/init_task.o
+     * arch/mips/kernel/init_task.c:30: warning: alignment of ‘init_thread_union’
+     * is greater than maximum object file alignment.  Using 32768
+     */
+    . = ALIGN(_PAGE_SIZE);
     *(.data.init_task)
 
     *(.data)
diff --git a/arch/mips/lib-64/dump_tlb.c b/arch/mips/lib-64/dump_tlb.c
index be8261be679..594df1a05ec 100644
--- a/arch/mips/lib-64/dump_tlb.c
+++ b/arch/mips/lib-64/dump_tlb.c
@@ -149,7 +149,7 @@ void dump_list_process(struct task_struct *t, void *address)
 	printk("Addr                 == %08lx\n", addr);
 	printk("tasks->mm.pgd        == %08lx\n", (unsigned long) t->mm->pgd);
 
-	page_dir = pgd_offset(t->mm, 0);
+	page_dir = pgd_offset(t->mm, 0UL);
 	printk("page_dir == %016lx\n", (unsigned long) page_dir);
 
 	pgd = pgd_offset(t->mm, addr);
@@ -184,13 +184,13 @@ void dump_list_current(void *address)
 	dump_list_process(current, address);
 }
 
-unsigned int vtop(void *address)
+unsigned long vtop(void *address)
 {
 	pgd_t	*pgd;
 	pud_t	*pud;
 	pmd_t	*pmd;
 	pte_t	*pte;
-	unsigned int addr, paddr;
+	unsigned long addr, paddr;
 
 	addr = (unsigned long) address;
 	pgd = pgd_offset(current->mm, addr);
diff --git a/arch/mips/mips-boards/generic/memory.c b/arch/mips/mips-boards/generic/memory.c
index be80c5dd4a0..eeed944e0f8 100644
--- a/arch/mips/mips-boards/generic/memory.c
+++ b/arch/mips/mips-boards/generic/memory.c
@@ -176,7 +176,7 @@ unsigned long __init prom_free_prom_memory(void)
 		if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
 			continue;
 
-		addr = boot_mem_map.map[i].addr;
+		addr = PAGE_ALIGN(boot_mem_map.map[i].addr);
 		while (addr < boot_mem_map.map[i].addr
 			      + boot_mem_map.map[i].size) {
 			ClearPageReserved(virt_to_page(__va(addr)));
diff --git a/arch/mips/mm/pg-r4k.c b/arch/mips/mm/pg-r4k.c
index b7c749232ff..d41fc5885e8 100644
--- a/arch/mips/mm/pg-r4k.c
+++ b/arch/mips/mm/pg-r4k.c
@@ -270,6 +270,20 @@ static inline void build_addiu_a2_a0(unsigned long offset)
 	emit_instruction(mi);
 }
 
+static inline void build_addiu_a2(unsigned long offset)
+{
+	union mips_instruction mi;
+
+	BUG_ON(offset > 0x7fff);
+
+	mi.i_format.opcode     = cpu_has_64bit_gp_regs ? daddiu_op : addiu_op;
+	mi.i_format.rs         = 6;		/* $a2 */
+	mi.i_format.rt         = 6;		/* $a2 */
+	mi.i_format.simmediate = offset;
+
+	emit_instruction(mi);
+}
+
 static inline void build_addiu_a1(unsigned long offset)
 {
 	union mips_instruction mi;
@@ -333,6 +347,7 @@ static inline void build_jr_ra(void)
 void __init build_clear_page(void)
 {
 	unsigned int loop_start;
+	unsigned long off;
 
 	epc = (unsigned int *) &clear_page_array;
 	instruction_pending = 0;
@@ -369,7 +384,12 @@ void __init build_clear_page(void)
 		}
 	}
 
-	build_addiu_a2_a0(PAGE_SIZE - (cpu_has_prefetch ? pref_offset_clear : 0));
+        off = PAGE_SIZE - (cpu_has_prefetch ? pref_offset_clear : 0);
+	if (off > 0x7fff) {
+		build_addiu_a2_a0(off >> 1);
+		build_addiu_a2(off >> 1);
+	} else
+		build_addiu_a2_a0(off);
 
 	if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())
 		build_insn_word(0x3c01a000);	/* lui     $at, 0xa000  */
@@ -420,12 +440,18 @@ dest = label();
 void __init build_copy_page(void)
 {
 	unsigned int loop_start;
+	unsigned long off;
 
 	epc = (unsigned int *) &copy_page_array;
 	store_offset = load_offset = 0;
 	instruction_pending = 0;
 
-	build_addiu_a2_a0(PAGE_SIZE - (cpu_has_prefetch ? pref_offset_copy : 0));
+	off = PAGE_SIZE - (cpu_has_prefetch ? pref_offset_copy : 0);
+	if (off > 0x7fff) {
+		build_addiu_a2_a0(off >> 1);
+		build_addiu_a2(off >> 1);
+	} else
+		build_addiu_a2_a0(off);
 
 	if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())
 		build_insn_word(0x3c01a000);	/* lui     $at, 0xa000  */
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 6f8b25cfa6f..fec318a1c8c 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -102,7 +102,7 @@ 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_dsll, insn_dsll32, insn_dsra, insn_dsrl, insn_dsrl32,
 	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,
@@ -145,6 +145,7 @@ 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 },
@@ -385,6 +386,7 @@ I_u2u1u3(_dsll);
 I_u2u1u3(_dsll32);
 I_u2u1u3(_dsra);
 I_u2u1u3(_dsrl);
+I_u2u1u3(_dsrl32);
 I_u3u1u2(_dsubu);
 I_0(_eret);
 I_u1(_j);
@@ -996,7 +998,12 @@ build_get_pmde64(u32 **p, struct label **l, struct reloc **r,
 #endif
 
 	l_vmalloc_done(l, *p);
-	i_dsrl(p, tmp, tmp, PGDIR_SHIFT-3); /* get pgd offset in bytes */
+
+	if (PGDIR_SHIFT - 3 < 32)		/* get pgd offset in bytes */
+		i_dsrl(p, tmp, tmp, PGDIR_SHIFT-3);
+	else
+		i_dsrl32(p, tmp, tmp, PGDIR_SHIFT - 3 - 32);
+
 	i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3);
 	i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */
 	i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */
@@ -1073,7 +1080,7 @@ build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
 
 static __init void build_adjust_context(u32 **p, unsigned int ctx)
 {
-	unsigned int shift = 4 - (PTE_T_LOG2 + 1);
+	unsigned int shift = 4 - (PTE_T_LOG2 + 1) + PAGE_SHIFT - 12;
 	unsigned int mask = (PTRS_PER_PTE / 2 - 1) << (PTE_T_LOG2 + 1);
 
 	switch (current_cpu_data.cputype) {