patch-2.1.101 linux/arch/mips/dec/decstation.S

• Lines: 370
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.100/linux/arch/mips/dec/decstation.S
• Orig date: Thu Jun 26 12:33:36 1997

diff -u --recursive --new-file v2.1.100/linux/arch/mips/dec/decstation.S linux/arch/mips/dec/decstation.S
@@ -1,369 +0,0 @@
-/*
- * arch/mips/kernel/decstation.S
- *
- * Copyright (C) 1995, 1996 Paul M. Antoine
- *
- * Written by Ralf Baechle and Andreas Busse, modified for DECStation
- * support by Paul Antoine.
- *
- * NOTE: There are references to R4X00 code in here, because I believe
- * 	 that there is an upgrade module for Personal DECStations with
- *	 such CPU's!
- *
- * FIXME: still plenty to do in this file, as much of the code towards
- * 	  the end hasn't been modified to suit the DECStation's interrupts.
- *        (Paul, you need to fix this file to comply with NAPS.  Won't be
- *         too hard - Ralf)
- */
-#include <asm/asm.h>
-#include <asm/mipsconfig.h>
-#include <asm/mipsregs.h>
-#include <asm/regdef.h>
-#include <asm/decstation.h>
-#include <asm/stackframe.h>
-#include <asm/bootinfo.h>
-
-/*
- * dec_entry: Called at boot in head.S to do DECStation setup, and to
- * fill in the boot_info structure.
- */
-		.text
-		.globl	dec_entry
-dec_entry:
-		/* Save the address of the REX call vector for later
-		 * use in printing debug messages.
-		 */
-		sw	a3,pmax_rex_base
-		la	a0,dec_signon
-		jal	pmax_printf
-		nop
-		/* Now set up the bootinfo structure with things that
-		 * should be loaded by the boot loader, except that
-		 * for the moment we're booting using tftp.
-		 */
-		la	t0,boot_info
-		li	t1,0x40			# 64 TLB entries
-/*
- * FIXME: Ideally, all DEC workstations should be supported, so here we
- *	  should put some clevernesses to determine machine type and CPU
- *	  type.  Needs a hierarchy of DEC machine types.  Perhaps Machine
- *	  AND Model fields in bootinfo structure?
- */
-		sw	t1,OFFSET_BOOTINFO_TLB_ENTRIES(t0)
-		li	t1,MACH_DECSTATION	# Machine type
-		sw	t1,(t0)
-		li	t1,CPU_R3000A		# CPU type
-		sw	t1,OFFSET_BOOTINFO_CPUTYPE(t0)
-/*
- * FIXME: the following should find the memory size from the boot PROM
- */
-		li	t1,0x80000000		# Lower memory bound
-		sw	t1,OFFSET_BOOTINFO_MEMLOWER(t0)
-		li	t1,0x88000000		# Upper memory bound (8MB)
-		sw	t1,OFFSET_BOOTINFO_MEMUPPER(t0)
-/*
- * FIXME: the following should determine the cache size a la the method
- *	  used in MACH.  For now we just guess - PMA.
- */
-		li	t1,0x100000		# 64K icache
-		sw	t1,OFFSET_BOOTINFO_ICACHE_SIZE(t0)
-		li	t1,0x100000		# 64K dcache
-		sw	t1,OFFSET_BOOTINFO_DCACHE_SIZE(t0)
-
-/*
- * FIXME: template for other bootinfo fields that probably need filling in...
- *
-		li	t1,0x80000000
-		sw	t1,OFFSET_BOOTINFO_(t0)
-*/
-
-/*
- * Now we need to move exception vector handler routines that appear
- * in head.S down to the right addresses, 'cos the DECStation loads
- * kernels at 0x80030000... <sigh>
- */
-
-/*
- * First move the TLB refill code down to offset 0x000, at addr 0x80000000
- */
-		la	t0,except_vec0		# begining of TLB exception code
-		la	t1,except_vec1		# end of TLB exception code
-		la	t2,0x80000000		# where the code should live
-		lw	t3,(t0)			# get first word
-1:		sw	t3,(t2)			# put it where it should go
-		addiu	t0,4			# increment both pointers
-		addiu	t2,4
-		lw	t3,(t0)			# will be in the delay slot
-		bne	t0,t1,1b
-
-/*
- * Now move the General Exception code down to offset 0x080 at 0x80000000
- */
-		la	t0,except_vec3		# begining of general exception code
-		la	t1,kernel_entry		# end of general exception code
-		la	t2,0x80000080		# where the code should live
-		lw	t3,(t0)			# get first word
-1:		sw	t3,(t2)
-		addiu	t0,4
-		addiu	t2,4
-		lw	t3,(t0)
-		bne	t0,t1,1b
-
-/*
- * FIXME: Don't forget to set the gp regster... why do I need this?
- */
-		la	gp,_gp
-		la	a0,dec_launch		# say where we are going
-		jal	pmax_printf
-		nop
-		j	kernel_entry
-		nop
-
-		.data
-		.align	2
-dec_signon:	.ascii	"\n\nLinux/MIPS DECStation Boot\n";
-		.asciiz "Copyright (C) Paul M. Antoine 1995, 1996 and others, 1994, 1995, 1996\n\n";
-dec_launch:	.asciiz	"Launching kernel...\n";
-		.text
-		.set	noreorder
-/*
- * decstation_handle_int: Interrupt handler for Personal DECStation 5000/2x
- *
- * FIXME: this is *extremely* experimental, though it is probably o.k. for
- *	  most DECStation models.
- */
-		NESTED(decstation_handle_int, FR_SIZE, ra)
-		.set	noat
-		SAVE_ALL
-		REG_S	sp,FR_ORIG_REG2(sp)
-		CLI
-		.set	at
-
-		/*
-		 * Get pending interrupts
-		 */
-		mfc0	t0,CP0_CAUSE		# get pending interrupts
-		mfc0	t1,CP0_STATUS		# get enabled interrupts
-		and	t0,t1			# isolate allowed ones
-		andi	t0,0xff00		# isolate pending bits
-/*
- * FIXME: The following branch was:
- *					beqz	t0,spurious_interrupt
- *
- *	  ...but the wonders of ecoff cause the gas assembler (ver 2.5.1 )
- *	  to complain:
- *
- *		  "Can not represent relocation in this object file format"...
- *
- *	  hence this hack to branch foward a bit, and then jump <sigh>
- *	  Perhaps a later version of gas will cope? - Paul
- *	  (No, this is impossible in COFF as well as in ELF. - Ralf)
- */
-		beqz	t0,3f;
-		sll	t0,16			# delay slot
-
-		/*
-		 * Find irq with highest priority
-		 * FIXME: This is slow
-		 */
-		la	t1,ll_vectors
-1:		bltz	t0,2f			# found pending irq
-		sll	t0,1
-		b	1b
-		subu	t1,PTRSIZE		# delay slot
-
-		/*
-		 * Do the low-level stuff
-		 */
-		.set	reorder
-2:		LOAD_L	t0,(t1)
-		jr	t0
-		.set	noreorder
-		END(decstation_handle_int)
-
-/*
- * FIXME: The hack mentioned above.
- */
-3:		j	spurious_interrupt
-		nop
-
-/*
- * FIXME: the rest of this is pretty suspect, as it's straight from
- * 	  jazz.S... and I really haven't altered it at all - Paul
- */
-
-/*
- * Used for keyboard driver's fake_keyboard_interrupt()
- * (Paul, even for i386 this is no longer being used -- Ralf)
- */
-ll_sw0:		li	s1,~IE_SW0
-		mfc0	t0,CP0_CAUSE
-		and	t0,s1
-		mtc0	t0,CP0_CAUSE
-	PRINT("sw0 received...\n")
-		li	t1,1
-		b	call_real
-		li	t3,PTRSIZE	# delay slot, re-map to irq level 1
-
-ll_sw1:		li	s1,~IE_SW1
-		PANIC("Unimplemented sw1 handler")
-
-loc_no_irq:	PANIC("Unimplemented loc_no_irq handler")
-loc_sound:	PANIC("Unimplemented loc_sound handler")
-loc_video:	PANIC("Unimplemented loc_video handler")
-loc_scsi:	PANIC("Unimplemented loc_scsi handler")
-
-/*
- * Ethernet interrupt, remapped to level 15
- * NOTE: Due to a bug somewhere in the kernel I was not able
- * to figure out, the PRINT() is necessary. Without this,
- * I get a "gfp called nonatomically from interrupt 00000000".
- * Only god knows why... Tell me if you find the reason!
- * (You were fouled by the caches and this is the wrong file for this
- *  comment - Ralf)
- * Andy, 6/16/95
- */
-loc_ethernet:	PANIC("Unimplemented loc_ethernet\n")
-
-/*
- * Keyboard interrupt, remapped to level 1
- */
-loc_keyboard:	PANIC("Unimplemented loc_keyboard\n")
-
-loc_mouse:	PANIC("Unimplemented loc_mouse handler")
-
-/*
- * Serial port 1 IRQ, remapped to level 3
- */
-loc_serial1:	PANIC("Unimplemented loc_serial handler")
-
-/*
- * Serial port 2 IRQ, remapped to level 4
- */
-loc_serial2:	PANIC("Unimplemented loc_serial handler")
-
-/*
- * Parallel port IRQ, remapped to level 5
- */
-loc_parallel:	PANIC("Unimplemented loc_parallel handler")
-
-/*
- * Floppy IRQ, remapped to level 6
- */
-loc_floppy:	PANIC("Unimplemented loc_floppy handler")
-  
-/*
- * Now call the real handler
- */
-loc_call:	la	t0,IRQ_vectors			# delay slot
-
-		/*
-		 * Temporarily disable interrupt source
-		 */
-/*		lhu	t2,JAZZ_IO_IRQ_ENABLE
-*/
-		addu	t0,t3			# make ptr to IRQ handler
-		LOAD_L	t0,(t0)
-		and	t2,s1			# delay slot
-/*		sh	t2,JAZZ_IO_IRQ_ENABLE */
-		jalr	t0			# call IRQ handler
-		nor	s1,zero,s1		# delay slot
-
-		/*
-		 * Reenable interrupt
-		 */
-/*		lhu	t2,JAZZ_IO_IRQ_ENABLE */
-		or	t2,s1
-/*		sh	t2,JAZZ_IO_IRQ_ENABLE */
-
-		jr	v0
-		nop				# delay slot
-
-ll_tc3:		PANIC("Unimplemented tc3 interrupt handler")
-
-ll_fpu:		PANIC("Unimplemented fpu interrupt handler")
-
-ll_io_error:	PANIC("Unimplemented I/O write timeout interrupt handler")
-
-ll_rtc:		PANIC("Unimplemented RTC interrupt handler")
-
-/*
- * Timer IRQ
- * We remap the timer irq to be more similar to a IBM compatible
- */
-ll_timer:	PANIC("Timer interrupt!\n");
-/*
- * CPU count/compare IRQ (unused)
- */
-ll_reset:	li	a0,0
-		jal	pmax_halt
-		li	a1,0			# delay slot
-
-/*
- * Now call the real handler
- */
-call_real:	la	t0,IRQ_vectors			# delay slot
-
-		/*
-		 * temporarily disable interrupt
-		 */
-		mfc0	t2,CP0_STATUS
-		and	t2,s1
-
-		addu	t0,t3
-		LOAD_L	t0,(t0)
-		mtc0	t2,CP0_STATUS		# delay slot
-		jalr	t0
-		nor	s1,zero,s1		# delay slot
-
-		/*
-		 * reenable interrupt
-		 */
-		mfc0	t2,CP0_STATUS
-		or	t2,s1
-		mtc0	t2,CP0_STATUS
-
-		jr	v0
-		nop				# delay slot
-
-/*
- * Just for debugging... load a0 with address of the point inside the
- * framebuffer at which you want to draw a line of 16x32 pixels.
- * Maxine's framebuffer starts at 0xaa000000.
- */
-		.set	reorder
-		LEAF(drawline)
-		li	t1,0xffffffff		# set all pixels on
-		li	t2,0x10			# we will write 16 words
-1:		sw	t1,(a0)			# write the first word
-		addiu	a0,a0,4			# move our framebuffer pointer
-		addiu	t2,t2,-1		# one less to do
-		bnez	t2,1b			# finished?
-		jr 	ra
-		END(drawline)
-
-/*
- * FIXME: I have begun to alter this table to reflect Personal DECStation
- *	  (i.e. Maxine) interrupts... Paul.
- */
-		.data
-		PTR	ll_sw0			# SW0
-		PTR	ll_sw1			# SW1
-		PTR	ll_timer		# Periodic interrupt
-		PTR	ll_rtc			# RTC periodic interrupt
-		PTR	ll_io_error		# Timeout on I/O writes
-		PTR	ll_tc3			# TC slot 3, motherboard
-		PTR	ll_reset		# Halt keycode (CTRL+ALT+ENTER)
-ll_vectors:	PTR	ll_fpu			# FPU
-
-local_vector:	PTR	loc_no_irq
-		PTR	loc_parallel
-		PTR	loc_floppy
-		PTR	loc_sound
-		PTR	loc_video
-		PTR	loc_ethernet
-		PTR	loc_scsi
-		PTR	loc_keyboard
-		PTR	loc_mouse
-		PTR	loc_serial1
-		PTR	loc_serial2