Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 489 insertions, 0 deletions

diff --git a/arch/mips/mm/pg-r4k.c b/arch/mips/mm/pg-r4k.c
new file mode 100644
index 00000000000..9f8b1654157
--- /dev/null
+++ b/arch/mips/mm/pg-r4k.c
@@ -0,0 +1,489 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2003, 04, 05 Ralf Baechle (ralf@linux-mips.org)
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+
+#include <asm/cacheops.h>
+#include <asm/inst.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/prefetch.h>
+#include <asm/system.h>
+#include <asm/bootinfo.h>
+#include <asm/mipsregs.h>
+#include <asm/mmu_context.h>
+#include <asm/cpu.h>
+#include <asm/war.h>
+
+#define half_scache_line_size()		(cpu_scache_line_size() >> 1)
+
+/*
+ * Maximum sizes:
+ *
+ * R4000 128 bytes S-cache:		0x58 bytes
+ * R4600 v1.7:				0x5c bytes
+ * R4600 v2.0:				0x60 bytes
+ * With prefetching, 16 byte strides	0xa0 bytes
+ */
+
+static unsigned int clear_page_array[0x130 / 4];
+
+void clear_page(void * page) __attribute__((alias("clear_page_array")));
+
+EXPORT_SYMBOL(clear_page);
+
+/*
+ * Maximum sizes:
+ *
+ * R4000 128 bytes S-cache:		0x11c bytes
+ * R4600 v1.7:				0x080 bytes
+ * R4600 v2.0:				0x07c bytes
+ * With prefetching, 16 byte strides	0x0b8 bytes
+ */
+static unsigned int copy_page_array[0x148 / 4];
+
+void copy_page(void *to, void *from) __attribute__((alias("copy_page_array")));
+
+EXPORT_SYMBOL(copy_page);
+
+/*
+ * This is suboptimal for 32-bit kernels; we assume that R10000 is only used
+ * with 64-bit kernels.  The prefetch offsets have been experimentally tuned
+ * an Origin 200.
+ */
+static int pref_offset_clear __initdata = 512;
+static int pref_offset_copy  __initdata = 256;
+
+static unsigned int pref_src_mode __initdata;
+static unsigned int pref_dst_mode __initdata;
+
+static int load_offset __initdata;
+static int store_offset __initdata;
+
+static unsigned int __initdata *dest, *epc;
+
+static unsigned int instruction_pending;
+static union mips_instruction delayed_mi;
+
+static void __init emit_instruction(union mips_instruction mi)
+{
+	if (instruction_pending)
+		*epc++ = delayed_mi.word;
+
+	instruction_pending = 1;
+	delayed_mi = mi;
+}
+
+static inline void flush_delay_slot_or_nop(void)
+{
+	if (instruction_pending) {
+		*epc++ = delayed_mi.word;
+		instruction_pending = 0;
+		return;
+	}
+
+	*epc++ = 0;
+}
+
+static inline unsigned int *label(void)
+{
+	if (instruction_pending) {
+		*epc++ = delayed_mi.word;
+		instruction_pending = 0;
+	}
+
+	return epc;
+}
+
+static inline void build_insn_word(unsigned int word)
+{
+	union mips_instruction mi;
+
+	mi.word		 = word;
+
+	emit_instruction(mi);
+}
+
+static inline void build_nop(void)
+{
+	build_insn_word(0);			/* nop */
+}
+
+static inline void build_src_pref(int advance)
+{
+	if (!(load_offset & (cpu_dcache_line_size() - 1))) {
+		union mips_instruction mi;
+
+		mi.i_format.opcode     = pref_op;
+		mi.i_format.rs         = 5;		/* $a1 */
+		mi.i_format.rt         = pref_src_mode;
+		mi.i_format.simmediate = load_offset + advance;
+
+		emit_instruction(mi);
+	}
+}
+
+static inline void __build_load_reg(int reg)
+{
+	union mips_instruction mi;
+	unsigned int width;
+
+	if (cpu_has_64bit_gp_regs) {
+		mi.i_format.opcode     = ld_op;
+		width = 8;
+	} else {
+		mi.i_format.opcode     = lw_op;
+		width = 4;
+	}
+	mi.i_format.rs         = 5;		/* $a1 */
+	mi.i_format.rt         = reg;		/* $reg */
+	mi.i_format.simmediate = load_offset;
+
+	load_offset += width;
+	emit_instruction(mi);
+}
+
+static inline void build_load_reg(int reg)
+{
+	if (cpu_has_prefetch)
+		build_src_pref(pref_offset_copy);
+
+	__build_load_reg(reg);
+}
+
+static inline void build_dst_pref(int advance)
+{
+	if (!(store_offset & (cpu_dcache_line_size() - 1))) {
+		union mips_instruction mi;
+
+		mi.i_format.opcode     = pref_op;
+		mi.i_format.rs         = 4;		/* $a0 */
+		mi.i_format.rt         = pref_dst_mode;
+		mi.i_format.simmediate = store_offset + advance;
+
+		emit_instruction(mi);
+	}
+}
+
+static inline void build_cdex_s(void)
+{
+	union mips_instruction mi;
+
+	if ((store_offset & (cpu_scache_line_size() - 1)))
+		return;
+
+	mi.c_format.opcode     = cache_op;
+	mi.c_format.rs         = 4;		/* $a0 */
+	mi.c_format.c_op       = 3;		/* Create Dirty Exclusive */
+	mi.c_format.cache      = 3;		/* Secondary Data Cache */
+	mi.c_format.simmediate = store_offset;
+
+	emit_instruction(mi);
+}
+
+static inline void build_cdex_p(void)
+{
+	union mips_instruction mi;
+
+	if (store_offset & (cpu_dcache_line_size() - 1))
+		return;
+
+	if (R4600_V1_HIT_CACHEOP_WAR && ((read_c0_prid() & 0xfff0) == 0x2010)) {
+		build_nop();
+		build_nop();
+		build_nop();
+		build_nop();
+	}
+
+	if (R4600_V2_HIT_CACHEOP_WAR && ((read_c0_prid() & 0xfff0) == 0x2020))
+		build_insn_word(0x8c200000);	/* lw      $zero, ($at) */
+
+	mi.c_format.opcode     = cache_op;
+	mi.c_format.rs         = 4;		/* $a0 */
+	mi.c_format.c_op       = 3;		/* Create Dirty Exclusive */
+	mi.c_format.cache      = 1;		/* Data Cache */
+	mi.c_format.simmediate = store_offset;
+
+	emit_instruction(mi);
+}
+
+static void __init __build_store_reg(int reg)
+{
+	union mips_instruction mi;
+	unsigned int width;
+
+	if (cpu_has_64bit_gp_regs ||
+	    (cpu_has_64bit_zero_reg && reg == 0)) {
+		mi.i_format.opcode     = sd_op;
+		width = 8;
+	} else {
+		mi.i_format.opcode     = sw_op;
+		width = 4;
+	}
+	mi.i_format.rs         = 4;		/* $a0 */
+	mi.i_format.rt         = reg;		/* $reg */
+	mi.i_format.simmediate = store_offset;
+
+	store_offset += width;
+	emit_instruction(mi);
+}
+
+static inline void build_store_reg(int reg)
+{
+	if (cpu_has_prefetch)
+		if (reg)
+			build_dst_pref(pref_offset_copy);
+		else
+			build_dst_pref(pref_offset_clear);
+	else if (cpu_has_cache_cdex_s)
+		build_cdex_s();
+	else if (cpu_has_cache_cdex_p)
+		build_cdex_p();
+
+	__build_store_reg(reg);
+}
+
+static inline void build_addiu_a2_a0(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         = 4;		/* $a0 */
+	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;
+
+	BUG_ON(offset > 0x7fff);
+
+	mi.i_format.opcode     = cpu_has_64bit_gp_regs ? daddiu_op : addiu_op;
+	mi.i_format.rs         = 5;		/* $a1 */
+	mi.i_format.rt         = 5;		/* $a1 */
+	mi.i_format.simmediate = offset;
+
+	load_offset -= offset;
+
+	emit_instruction(mi);
+}
+
+static inline void build_addiu_a0(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         = 4;		/* $a0 */
+	mi.i_format.rt         = 4;		/* $a0 */
+	mi.i_format.simmediate = offset;
+
+	store_offset -= offset;
+
+	emit_instruction(mi);
+}
+
+static inline void build_bne(unsigned int *dest)
+{
+	union mips_instruction mi;
+
+	mi.i_format.opcode = bne_op;
+	mi.i_format.rs     = 6;			/* $a2 */
+	mi.i_format.rt     = 4;			/* $a0 */
+	mi.i_format.simmediate = dest - epc - 1;
+
+	*epc++ = mi.word;
+	flush_delay_slot_or_nop();
+}
+
+static inline void build_jr_ra(void)
+{
+	union mips_instruction mi;
+
+	mi.r_format.opcode = spec_op;
+	mi.r_format.rs     = 31;
+	mi.r_format.rt     = 0;
+	mi.r_format.rd     = 0;
+	mi.r_format.re     = 0;
+	mi.r_format.func   = jr_op;
+
+	*epc++ = mi.word;
+	flush_delay_slot_or_nop();
+}
+
+void __init build_clear_page(void)
+{
+	unsigned int loop_start;
+
+	epc = (unsigned int *) &clear_page_array;
+	instruction_pending = 0;
+	store_offset = 0;
+
+	if (cpu_has_prefetch) {
+		switch (current_cpu_data.cputype) {
+		case CPU_RM9000:
+			/*
+			 * As a workaround for erratum G105 which make the
+			 * PrepareForStore hint unusable we fall back to
+			 * StoreRetained on the RM9000.  Once it is known which
+			 * versions of the RM9000 we'll be able to condition-
+			 * alize this.
+			 */
+
+		case CPU_R10000:
+		case CPU_R12000:
+			pref_src_mode = Pref_LoadStreamed;
+			pref_dst_mode = Pref_StoreStreamed;
+			break;
+
+		default:
+			pref_src_mode = Pref_LoadStreamed;
+			pref_dst_mode = Pref_PrepareForStore;
+			break;
+		}
+	}
+
+	build_addiu_a2_a0(PAGE_SIZE - (cpu_has_prefetch ? pref_offset_clear : 0));
+
+	if (R4600_V2_HIT_CACHEOP_WAR && ((read_c0_prid() & 0xfff0) == 0x2020))
+		build_insn_word(0x3c01a000);	/* lui     $at, 0xa000  */
+
+dest = label();
+	do {
+		build_store_reg(0);
+		build_store_reg(0);
+		build_store_reg(0);
+		build_store_reg(0);
+	} while (store_offset < half_scache_line_size());
+	build_addiu_a0(2 * store_offset);
+	loop_start = store_offset;
+	do {
+		build_store_reg(0);
+		build_store_reg(0);
+		build_store_reg(0);
+		build_store_reg(0);
+	} while ((store_offset - loop_start) < half_scache_line_size());
+	build_bne(dest);
+
+	if (cpu_has_prefetch && pref_offset_clear) {
+		build_addiu_a2_a0(pref_offset_clear);
+	dest = label();
+		loop_start = store_offset;
+		do {
+			__build_store_reg(0);
+			__build_store_reg(0);
+			__build_store_reg(0);
+			__build_store_reg(0);
+		} while ((store_offset - loop_start) < half_scache_line_size());
+		build_addiu_a0(2 * store_offset);
+		loop_start = store_offset;
+		do {
+			__build_store_reg(0);
+			__build_store_reg(0);
+			__build_store_reg(0);
+			__build_store_reg(0);
+		} while ((store_offset - loop_start) < half_scache_line_size());
+		build_bne(dest);
+	}
+
+	build_jr_ra();
+
+	flush_icache_range((unsigned long)&clear_page_array,
+	                   (unsigned long) epc);
+
+	BUG_ON(epc > clear_page_array + ARRAY_SIZE(clear_page_array));
+}
+
+void __init build_copy_page(void)
+{
+	unsigned int loop_start;
+
+	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));
+
+	if (R4600_V2_HIT_CACHEOP_WAR && ((read_c0_prid() & 0xfff0) == 0x2020))
+		build_insn_word(0x3c01a000);	/* lui     $at, 0xa000  */
+
+dest = label();
+	loop_start = store_offset;
+	do {
+		build_load_reg( 8);
+		build_load_reg( 9);
+		build_load_reg(10);
+		build_load_reg(11);
+		build_store_reg( 8);
+		build_store_reg( 9);
+		build_store_reg(10);
+		build_store_reg(11);
+	} while ((store_offset - loop_start) < half_scache_line_size());
+	build_addiu_a0(2 * store_offset);
+	build_addiu_a1(2 * load_offset);
+	loop_start = store_offset;
+	do {
+		build_load_reg( 8);
+		build_load_reg( 9);
+		build_load_reg(10);
+		build_load_reg(11);
+		build_store_reg( 8);
+		build_store_reg( 9);
+		build_store_reg(10);
+		build_store_reg(11);
+	} while ((store_offset - loop_start) < half_scache_line_size());
+	build_bne(dest);
+
+	if (cpu_has_prefetch && pref_offset_copy) {
+		build_addiu_a2_a0(pref_offset_copy);
+	dest = label();
+		loop_start = store_offset;
+		do {
+			__build_load_reg( 8);
+			__build_load_reg( 9);
+			__build_load_reg(10);
+			__build_load_reg(11);
+			__build_store_reg( 8);
+			__build_store_reg( 9);
+			__build_store_reg(10);
+			__build_store_reg(11);
+		} while ((store_offset - loop_start) < half_scache_line_size());
+		build_addiu_a0(2 * store_offset);
+		build_addiu_a1(2 * load_offset);
+		loop_start = store_offset;
+		do {
+			__build_load_reg( 8);
+			__build_load_reg( 9);
+			__build_load_reg(10);
+			__build_load_reg(11);
+			__build_store_reg( 8);
+			__build_store_reg( 9);
+			__build_store_reg(10);
+			__build_store_reg(11);
+		} while ((store_offset - loop_start) < half_scache_line_size());
+		build_bne(dest);
+	}
+
+	build_jr_ra();
+
+	flush_icache_range((unsigned long)&copy_page_array,
+	                   (unsigned long) epc);
+
+	BUG_ON(epc > copy_page_array + ARRAY_SIZE(copy_page_array));
+}