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, 639 insertions, 0 deletions

diff --git a/arch/frv/kernel/head.S b/arch/frv/kernel/head.S
new file mode 100644
index 000000000000..c73b4fe9f6ca
--- /dev/null
+++ b/arch/frv/kernel/head.S
@@ -0,0 +1,639 @@
+/* head.S: kernel entry point for FR-V kernel
+ *
+ * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/threads.h>
+#include <linux/linkage.h>
+#include <asm/ptrace.h>
+#include <asm/page.h>
+#include <asm/spr-regs.h>
+#include <asm/mb86943a.h>
+#include <asm/cache.h>
+#include "head.inc"
+
+###############################################################################
+#
+# void _boot(unsigned long magic, char *command_line) __attribute__((noreturn))
+#
+# - if magic is 0xdead1eaf, then command_line is assumed to point to the kernel
+#   command line string
+#
+###############################################################################
+	.section	.text.head,"ax"
+	.balign		4
+
+	.globl		_boot, __head_reference
+        .type		_boot,@function
+_boot:
+__head_reference:
+	sethi.p		%hi(LED_ADDR),gr30
+	setlo		%lo(LED_ADDR),gr30
+
+	LEDS		0x0000
+
+	# calculate reference address for PC-relative stuff
+	call		0f
+0:	movsg		lr,gr26
+	addi		gr26,#__head_reference-0b,gr26
+
+	# invalidate and disable both of the caches and turn off the memory access checking
+	dcef		@(gr0,gr0),1
+	bar
+
+	sethi.p		%hi(~(HSR0_ICE|HSR0_DCE|HSR0_CBM|HSR0_EIMMU|HSR0_EDMMU)),gr4
+	setlo		%lo(~(HSR0_ICE|HSR0_DCE|HSR0_CBM|HSR0_EIMMU|HSR0_EDMMU)),gr4
+	movsg		hsr0,gr5
+	and		gr4,gr5,gr5
+	movgs		gr5,hsr0
+	movsg		hsr0,gr5
+
+	LEDS		0x0001
+
+	icei		@(gr0,gr0),1
+	dcei		@(gr0,gr0),1
+	bar
+
+	# turn the instruction cache back on
+	sethi.p		%hi(HSR0_ICE),gr4
+	setlo		%lo(HSR0_ICE),gr4
+	movsg		hsr0,gr5
+	or		gr4,gr5,gr5
+	movgs		gr5,hsr0
+	movsg		hsr0,gr5
+
+	bar
+
+	LEDS		0x0002
+
+	# retrieve the parameters (including command line) before we overwrite them
+	sethi.p		%hi(0xdead1eaf),gr7
+	setlo		%lo(0xdead1eaf),gr7
+	subcc		gr7,gr8,gr0,icc0
+	bne		icc0,#0,__head_no_parameters
+
+	sethi.p		%hi(redboot_command_line-1),gr6
+	setlo		%lo(redboot_command_line-1),gr6
+	sethi.p		%hi(__head_reference),gr4
+	setlo		%lo(__head_reference),gr4
+	sub		gr6,gr4,gr6
+	add.p		gr6,gr26,gr6
+	subi		gr9,#1,gr9
+	setlos.p	#511,gr4
+	setlos		#1,gr5
+
+__head_copy_cmdline:
+	ldubu.p		@(gr9,gr5),gr16
+	subicc		gr4,#1,gr4,icc0
+	stbu.p		gr16,@(gr6,gr5)
+	subicc		gr16,#0,gr0,icc1
+	bls		icc0,#0,__head_end_cmdline
+	bne		icc1,#1,__head_copy_cmdline
+__head_end_cmdline:
+	stbu		gr0,@(gr6,gr5)
+__head_no_parameters:
+
+###############################################################################
+#
+# we need to relocate the SDRAM to 0x00000000 (linux) or 0xC0000000 (uClinux)
+# - note that we're going to have to run entirely out of the icache whilst
+#   fiddling with the SDRAM controller registers
+#
+###############################################################################
+#ifdef CONFIG_MMU
+	call		__head_fr451_describe_sdram
+
+#else
+	movsg		psr,gr5
+	srli		gr5,#28,gr5
+	subicc		gr5,#3,gr0,icc0
+	beq		icc0,#0,__head_fr551_sdram
+
+	call		__head_fr401_describe_sdram
+	bra		__head_do_sdram
+
+__head_fr551_sdram:
+	call		__head_fr555_describe_sdram
+	LEDS		0x000d
+
+__head_do_sdram:
+#endif
+
+	# preload the registers with invalid values in case any DBR/DARS are marked not present
+	sethi.p		%hi(0xfe000000),gr17		; unused SDRAM DBR value
+	setlo		%lo(0xfe000000),gr17
+	or.p		gr17,gr0,gr20
+	or		gr17,gr0,gr21
+	or.p		gr17,gr0,gr22
+	or		gr17,gr0,gr23
+
+	# consult the SDRAM controller CS address registers
+	cld		@(gr14,gr0 ),gr20,	cc0,#1	; DBR0 / DARS0
+	cld		@(gr14,gr11),gr21,	cc1,#1	; DBR1 / DARS1
+	cld		@(gr14,gr12),gr22,	cc2,#1	; DBR2 / DARS2
+	cld.p		@(gr14,gr13),gr23,	cc3,#1	; DBR3 / DARS3
+
+	sll		gr20,gr15,gr20			; shift values up for FR551
+	sll		gr21,gr15,gr21
+	sll		gr22,gr15,gr22
+	sll		gr23,gr15,gr23
+
+	LEDS		0x0003
+
+	# assume the lowest valid CS line to be the SDRAM base and get its address
+	subcc		gr20,gr17,gr0,icc0
+	subcc.p		gr21,gr17,gr0,icc1
+	subcc		gr22,gr17,gr0,icc2
+	subcc.p		gr23,gr17,gr0,icc3
+	ckne		icc0,cc4			; T if DBR0 != 0xfe000000
+	ckne		icc1,cc5
+	ckne		icc2,cc6
+	ckne		icc3,cc7
+	cor		gr23,gr0,gr24,		cc7,#1	; GR24 = SDRAM base
+	cor		gr22,gr0,gr24,		cc6,#1
+	cor		gr21,gr0,gr24,		cc5,#1
+	cor		gr20,gr0,gr24,		cc4,#1
+
+	# calculate the displacement required to get the SDRAM into the right place in memory
+	sethi.p		%hi(__sdram_base),gr16
+	setlo		%lo(__sdram_base),gr16
+	sub		gr16,gr24,gr16			; delta = __sdram_base - DBRx
+
+	# calculate the new values to go in the controller regs
+	cadd.p		gr20,gr16,gr20,		cc4,#1	; DCS#0 (new) = DCS#0 (old) + delta
+	cadd		gr21,gr16,gr21,		cc5,#1
+	cadd.p		gr22,gr16,gr22,		cc6,#1
+	cadd		gr23,gr16,gr23,		cc7,#1
+
+	srl		gr20,gr15,gr20			; shift values down for FR551
+	srl		gr21,gr15,gr21
+	srl		gr22,gr15,gr22
+	srl		gr23,gr15,gr23
+
+	# work out the address at which the reg updater resides and lock it into icache
+	# also work out the address the updater will jump to when finished
+	sethi.p		%hi(__head_move_sdram-__head_reference),gr18
+	setlo		%lo(__head_move_sdram-__head_reference),gr18
+	sethi.p		%hi(__head_sdram_moved-__head_reference),gr19
+	setlo		%lo(__head_sdram_moved-__head_reference),gr19
+	add.p		gr18,gr26,gr18
+	add		gr19,gr26,gr19
+	add.p		gr19,gr16,gr19			; moved = addr + (__sdram_base - DBRx)
+	add		gr18,gr5,gr4			; two cachelines probably required
+
+	icpl		gr18,gr0,#1			; load and lock the cachelines
+	icpl		gr4,gr0,#1
+	LEDS		0x0004
+	membar
+	bar
+	jmpl		@(gr18,gr0)
+
+	.balign		L1_CACHE_BYTES
+__head_move_sdram:
+	cst		gr20,@(gr14,gr0 ),	cc4,#1
+	cst		gr21,@(gr14,gr11),	cc5,#1
+	cst		gr22,@(gr14,gr12),	cc6,#1
+	cst		gr23,@(gr14,gr13),	cc7,#1
+	cld		@(gr14,gr0 ),gr20,	cc4,#1
+	cld		@(gr14,gr11),gr21,	cc5,#1
+	cld		@(gr14,gr12),gr22,	cc4,#1
+	cld		@(gr14,gr13),gr23,	cc7,#1
+	bar
+	membar
+	jmpl		@(gr19,gr0)
+
+	.balign		L1_CACHE_BYTES
+__head_sdram_moved:
+	icul		gr18
+	add		gr18,gr5,gr4
+	icul		gr4
+	icei		@(gr0,gr0),1
+	dcei		@(gr0,gr0),1
+
+	LEDS		0x0005
+
+	# recalculate reference address
+	call		0f
+0:	movsg		lr,gr26
+	addi		gr26,#__head_reference-0b,gr26
+
+
+###############################################################################
+#
+# move the kernel image down to the bottom of the SDRAM
+#
+###############################################################################
+	sethi.p		%hi(__kernel_image_size_no_bss+15),gr4
+	setlo		%lo(__kernel_image_size_no_bss+15),gr4
+	srli.p		gr4,#4,gr4			; count
+	or		gr26,gr26,gr16			; source
+
+	sethi.p		%hi(__sdram_base),gr17		; destination
+	setlo		%lo(__sdram_base),gr17
+
+	setlos		#8,gr5
+	sub.p		gr16,gr5,gr16			; adjust src for LDDU
+	sub		gr17,gr5,gr17			; adjust dst for LDDU
+
+	sethi.p		%hi(__head_move_kernel-__head_reference),gr18
+	setlo		%lo(__head_move_kernel-__head_reference),gr18
+	sethi.p		%hi(__head_kernel_moved-__head_reference+__sdram_base),gr19
+	setlo		%lo(__head_kernel_moved-__head_reference+__sdram_base),gr19
+	add		gr18,gr26,gr18
+	icpl		gr18,gr0,#1
+	jmpl		@(gr18,gr0)
+
+	.balign		32
+__head_move_kernel:
+	lddu		@(gr16,gr5),gr10
+	lddu		@(gr16,gr5),gr12
+	stdu.p		gr10,@(gr17,gr5)
+	subicc		gr4,#1,gr4,icc0
+	stdu.p		gr12,@(gr17,gr5)
+	bhi		icc0,#0,__head_move_kernel
+	jmpl		@(gr19,gr0)
+
+	.balign		32
+__head_kernel_moved:
+	icul		gr18
+	icei		@(gr0,gr0),1
+	dcei		@(gr0,gr0),1
+
+	LEDS		0x0006
+
+	# recalculate reference address
+	call		0f
+0:	movsg		lr,gr26
+	addi		gr26,#__head_reference-0b,gr26
+
+
+###############################################################################
+#
+# rearrange the iomem map and set the protection registers
+#
+###############################################################################
+
+#ifdef CONFIG_MMU
+	LEDS		0x3301
+	call		__head_fr451_set_busctl
+	LEDS		0x3303
+	call		__head_fr451_survey_sdram
+	LEDS		0x3305
+	call		__head_fr451_set_protection
+
+#else
+	movsg		psr,gr5
+	srli		gr5,#PSR_IMPLE_SHIFT,gr5
+	subicc		gr5,#PSR_IMPLE_FR551,gr0,icc0
+	beq		icc0,#0,__head_fr555_memmap
+	subicc		gr5,#PSR_IMPLE_FR451,gr0,icc0
+	beq		icc0,#0,__head_fr451_memmap
+
+	LEDS		0x3101
+	call		__head_fr401_set_busctl
+	LEDS		0x3103
+	call		__head_fr401_survey_sdram
+	LEDS		0x3105
+	call		__head_fr401_set_protection
+	bra		__head_done_memmap
+
+__head_fr451_memmap:
+	LEDS		0x3301
+	call		__head_fr401_set_busctl
+	LEDS		0x3303
+	call		__head_fr401_survey_sdram
+	LEDS		0x3305
+	call		__head_fr451_set_protection
+	bra		__head_done_memmap
+
+__head_fr555_memmap:
+	LEDS		0x3501
+	call		__head_fr555_set_busctl
+	LEDS		0x3503
+	call		__head_fr555_survey_sdram
+	LEDS		0x3505
+	call		__head_fr555_set_protection
+
+__head_done_memmap:
+#endif
+	LEDS		0x0007
+
+###############################################################################
+#
+# turn the data cache and MMU on
+# - for the FR451 this'll mean that the window through which the kernel is
+#   viewed will change
+#
+###############################################################################
+
+#ifdef CONFIG_MMU
+#define MMUMODE		HSR0_EIMMU|HSR0_EDMMU|HSR0_EXMMU|HSR0_EDAT|HSR0_XEDAT
+#else
+#define MMUMODE		HSR0_EIMMU|HSR0_EDMMU
+#endif
+
+	movsg		hsr0,gr5
+
+	sethi.p		%hi(MMUMODE),gr4
+	setlo		%lo(MMUMODE),gr4
+	or		gr4,gr5,gr5
+
+#if defined(CONFIG_FRV_DEFL_CACHE_WTHRU)
+	sethi.p		%hi(HSR0_DCE|HSR0_CBM_WRITE_THRU),gr4
+	setlo		%lo(HSR0_DCE|HSR0_CBM_WRITE_THRU),gr4
+#elif defined(CONFIG_FRV_DEFL_CACHE_WBACK)
+	sethi.p		%hi(HSR0_DCE|HSR0_CBM_COPY_BACK),gr4
+	setlo		%lo(HSR0_DCE|HSR0_CBM_COPY_BACK),gr4
+#elif defined(CONFIG_FRV_DEFL_CACHE_WBEHIND)
+	sethi.p		%hi(HSR0_DCE|HSR0_CBM_COPY_BACK),gr4
+	setlo		%lo(HSR0_DCE|HSR0_CBM_COPY_BACK),gr4
+
+	movsg		psr,gr6
+	srli		gr6,#24,gr6
+	cmpi		gr6,#0x50,icc0		// FR451
+	beq		icc0,#0,0f
+	cmpi		gr6,#0x40,icc0		// FR405
+	bne		icc0,#0,1f
+0:
+	# turn off write-allocate
+	sethi.p		%hi(HSR0_NWA),gr6
+	setlo		%lo(HSR0_NWA),gr6
+	or		gr4,gr6,gr4
+1:
+
+#else
+#error No default cache configuration set
+#endif
+
+	or		gr4,gr5,gr5
+	movgs		gr5,hsr0
+	bar
+
+	LEDS		0x0008
+
+	sethi.p		%hi(__head_mmu_enabled),gr19
+	setlo		%lo(__head_mmu_enabled),gr19
+	jmpl		@(gr19,gr0)
+
+__head_mmu_enabled:
+	icei		@(gr0,gr0),#1
+	dcei		@(gr0,gr0),#1
+
+	LEDS		0x0009
+
+#ifdef CONFIG_MMU
+	call		__head_fr451_finalise_protection
+#endif
+
+	LEDS		0x000a
+
+###############################################################################
+#
+# set up the runtime environment
+#
+###############################################################################
+
+	# clear the BSS area
+	sethi.p		%hi(__bss_start),gr4
+	setlo		%lo(__bss_start),gr4
+	sethi.p		%hi(_end),gr5
+	setlo		%lo(_end),gr5
+	or.p		gr0,gr0,gr18
+	or		gr0,gr0,gr19
+
+0:
+	stdi		gr18,@(gr4,#0)
+	stdi		gr18,@(gr4,#8)
+	stdi		gr18,@(gr4,#16)
+	stdi.p		gr18,@(gr4,#24)
+	addi		gr4,#24,gr4
+	subcc		gr5,gr4,gr0,icc0
+	bhi		icc0,#2,0b
+
+	LEDS		0x000b
+
+	# save the SDRAM details
+	sethi.p		%hi(__sdram_old_base),gr4
+	setlo		%lo(__sdram_old_base),gr4
+	st		gr24,@(gr4,gr0)
+
+	sethi.p		%hi(__sdram_base),gr5
+	setlo		%lo(__sdram_base),gr5
+	sethi.p		%hi(memory_start),gr4
+	setlo		%lo(memory_start),gr4
+	st		gr5,@(gr4,gr0)
+
+	add		gr25,gr5,gr25
+	sethi.p		%hi(memory_end),gr4
+	setlo		%lo(memory_end),gr4
+	st		gr25,@(gr4,gr0)
+
+	# point the TBR at the kernel trap table
+	sethi.p		%hi(__entry_kerneltrap_table),gr4
+	setlo		%lo(__entry_kerneltrap_table),gr4
+	movgs		gr4,tbr
+
+	# set up the exception frame for init
+	sethi.p		%hi(__kernel_frame0_ptr),gr28
+	setlo		%lo(__kernel_frame0_ptr),gr28
+	sethi.p		%hi(_gp),gr16
+	setlo		%lo(_gp),gr16
+	sethi.p		%hi(__entry_usertrap_table),gr4
+	setlo		%lo(__entry_usertrap_table),gr4
+
+	lddi		@(gr28,#0),gr28		; load __frame & current
+	ldi.p		@(gr29,#4),gr15		; set current_thread
+
+	or		gr0,gr0,fp
+	or		gr28,gr0,sp
+
+	sti.p		gr4,@(gr28,REG_TBR)
+	setlos		#ISR_EDE|ISR_DTT_DIVBYZERO|ISR_EMAM_EXCEPTION,gr5
+	movgs		gr5,isr
+
+	# turn on and off various CPU services
+	movsg		psr,gr22
+	sethi.p		%hi(#PSR_EM|PSR_EF|PSR_CM|PSR_NEM),gr4
+	setlo		%lo(#PSR_EM|PSR_EF|PSR_CM|PSR_NEM),gr4
+	or		gr22,gr4,gr22
+	movgs		gr22,psr
+
+	andi		gr22,#~(PSR_PIL|PSR_PS|PSR_S),gr22
+	ori		gr22,#PSR_ET,gr22
+	sti		gr22,@(gr28,REG_PSR)
+
+
+###############################################################################
+#
+# set up the registers and jump into the kernel
+#
+###############################################################################
+
+	LEDS		0x000c
+
+	# initialise the processor and the peripherals
+	#call		SYMBOL_NAME(processor_init)
+	#call		SYMBOL_NAME(unit_init)
+	#LEDS		0x0aff
+
+	sethi.p		#0xe5e5,gr3
+	setlo		#0xe5e5,gr3
+	or.p		gr3,gr0,gr4
+	or		gr3,gr0,gr5
+	or.p		gr3,gr0,gr6
+	or		gr3,gr0,gr7
+	or.p		gr3,gr0,gr8
+	or		gr3,gr0,gr9
+	or.p		gr3,gr0,gr10
+	or		gr3,gr0,gr11
+	or.p		gr3,gr0,gr12
+	or		gr3,gr0,gr13
+	or.p		gr3,gr0,gr14
+	or		gr3,gr0,gr17
+	or.p		gr3,gr0,gr18
+	or		gr3,gr0,gr19
+	or.p		gr3,gr0,gr20
+	or		gr3,gr0,gr21
+	or.p		gr3,gr0,gr23
+	or		gr3,gr0,gr24
+	or.p		gr3,gr0,gr25
+	or		gr3,gr0,gr26
+	or.p		gr3,gr0,gr27
+#	or		gr3,gr0,gr30
+	or		gr3,gr0,gr31
+	movgs		gr0,lr
+	movgs		gr0,lcr
+	movgs		gr0,ccr
+	movgs		gr0,cccr
+
+#ifdef CONFIG_MMU
+	movgs		gr3,scr2
+	movgs		gr3,scr3
+#endif
+
+	LEDS		0x0fff
+
+	# invoke the debugging stub if present
+	# - arch/frv/kernel/debug-stub.c will shift control directly to init/main.c
+	#   (it will not return here)
+	break
+	.globl		__debug_stub_init_break
+__debug_stub_init_break:
+
+	# however, if you need to use an ICE, and don't care about using any userspace
+	# debugging tools (such as the ptrace syscall), you can just step over the break
+	# above and get to the kernel this way
+	# look at arch/frv/kernel/debug-stub.c: debug_stub_init() to see what you've missed
+	call		start_kernel
+
+	.globl		__head_end
+__head_end:
+	.size		_boot, .-_boot
+
+	# provide a point for GDB to place a break
+	.section	.text.start,"ax"
+	.globl		_start
+	.balign		4
+_start:
+	call		_boot
+
+	.previous
+###############################################################################
+#
+# split a tile off of the region defined by GR8-GR9
+#
+#	ENTRY:			EXIT:
+# GR4	-			IAMPR value representing tile
+# GR5	-			DAMPR value representing tile
+# GR6	-			IAMLR value representing tile
+# GR7	-			DAMLR value representing tile
+# GR8	region base pointer	[saved]
+# GR9	region top pointer	updated to exclude new tile
+# GR11	xAMLR mask		[saved]
+# GR25	SDRAM size		[saved]
+# GR30	LED address		[saved]
+#
+# - GR8 and GR9 should be rounded up/down to the nearest megabyte before calling
+#
+###############################################################################
+	.globl		__head_split_region
+	.type		__head_split_region,@function
+__head_split_region:
+	subcc.p		gr9,gr8,gr4,icc0
+	setlos		#31,gr5
+	scan.p		gr4,gr0,gr6
+	beq		icc0,#0,__head_region_empty
+	sub.p		gr5,gr6,gr6			; bit number of highest set bit (1MB=>20)
+	setlos		#1,gr4
+	sll.p		gr4,gr6,gr4			; size of region (1 << bitno)
+	subi		gr6,#17,gr6			; 1MB => 0x03
+	slli.p		gr6,#4,gr6			; 1MB => 0x30
+	sub		gr9,gr4,gr9			; move uncovered top down
+
+	or		gr9,gr6,gr4
+	ori		gr4,#xAMPRx_S_USER|xAMPRx_C_CACHED|xAMPRx_V,gr4
+	or.p		gr4,gr0,gr5
+
+	and		gr4,gr11,gr6
+	and.p		gr5,gr11,gr7
+	bralr
+
+__head_region_empty:
+	or.p		gr0,gr0,gr4
+	or		gr0,gr0,gr5
+	or.p		gr0,gr0,gr6
+	or		gr0,gr0,gr7
+	bralr
+	.size		__head_split_region, .-__head_split_region
+
+###############################################################################
+#
+# write the 32-bit hex number in GR8 to ttyS0
+#
+###############################################################################
+#if 0
+	.globl		__head_write_to_ttyS0
+	.type		__head_write_to_ttyS0,@function
+__head_write_to_ttyS0:
+	sethi.p		%hi(0xfeff9c00),gr31
+	setlo		%lo(0xfeff9c00),gr31
+	setlos		#8,gr20
+
+0:	ldubi		@(gr31,#5*8),gr21
+	andi		gr21,#0x60,gr21
+	subicc		gr21,#0x60,gr21,icc0
+	bne		icc0,#0,0b
+
+1:	srli		gr8,#28,gr21
+	slli		gr8,#4,gr8
+
+	addi		gr21,#'0',gr21
+	subicc		gr21,#'9',gr0,icc0
+	bls		icc0,#2,2f
+	addi		gr21,#'A'-'0'-10,gr21
+2:
+	stbi		gr21,@(gr31,#0*8)
+	subicc		gr20,#1,gr20,icc0
+	bhi		icc0,#2,1b
+
+	setlos		#'\r',gr21
+	stbi		gr21,@(gr31,#0*8)
+
+	setlos		#'\n',gr21
+	stbi		gr21,@(gr31,#0*8)
+
+3:	ldubi		@(gr31,#5*8),gr21
+	andi		gr21,#0x60,gr21
+	subicc		gr21,#0x60,gr21,icc0
+	bne		icc0,#0,3b
+	bralr
+
+	.size		__head_write_to_ttyS0, .-__head_write_to_ttyS0
+#endif