halboot.si

ecos为实时嵌入式操作系统

#ifndef CYGONCE_HAL_HALBOOT_SI /* -*-asm-*- */
#define CYGONCE_HAL_HALBOOT_SI
// ====================================================================
//
//	<platform>/halboot.si
//
//	HAL bootup platform-oriented code (assembler)
//
// ====================================================================
//####COPYRIGHTBEGIN####
//
// -------------------------------------------
// The contents of this file are subject to the Cygnus eCos Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License.  You may obtain a copy of the License at
// http://sourceware.cygnus.com/ecos
// 
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
// License for the specific language governing rights and limitations under
// the License.
// 
// The Original Code is eCos - Embedded Cygnus Operating System, released
// September 30, 1998.
// 
// The Initial Developer of the Original Code is Cygnus.  Portions created
// by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved.
// -------------------------------------------
//
//####COPYRIGHTEND####
// ====================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): 	        hmt
// Contributors:	hmt
// Date:	        1999-02-01
// Purpose:	        Bootup code, platform oriented.
// Description:
//
//####DESCRIPTIONEND####
//
// ====================================================================

// External Platform Initial Setup
//
// This should set up RAM and caches, and calm down any external
// interrupt sources.
//
// It is just plain included in vectors.S
//
// RAM has not yet been touched at all; in fact all you have is a
// register window selected.

	
#ifdef CYG_HAL_STARTUP_RAM
	! copy the real instructions into the vector:	
	rd	%tbr, %g1
	andn	%g1, 0xfff, %g1		! clear non-address bits					
	set	real_vector_instructions, %l0
	ld	[ %l0 ], %l1
	st	%l1, [ %g1 ]		! into the vector
	ld	[ %l0 + 4 ], %l1
	st	%l1, [ %g1 + 4 ]	! into the vector
	! then invalidate the instruction cache:
	set	3, %l0
	set	0x00001000, %l1
	set	0x80001000, %l2
	sta	%l0, [ %l1 ] 0x0c
	sta	%l0, [ %l2 ] 0x0c
	! and the data cache
	sta	%l0, [ %l1 ] 0x0e
	sta	%l0, [ %l2 ] 0x0e
	nop
	nop
	nop
	nop				! should be enough
#endif // CYG_HAL_STARTUP_RAM
	

#include <cyg/hal/hal_cpu.h>		// a copy of CygMon~s cpu.h
	

/* Address of clock switch */
#define CLKSW_ADDR  0x01000003

/* Address of SW1 */
#define SW1_ADDR  0x02000003

/* Address of LED bank */
#define LED_ADDR  0x02000003

#define SRAM_BASE 0x30000000
#define SRAM_END  0x30080000


#define DRAM_BASE      0x04000000	/* base of system DRAM */
#define CS3_BASE       0x00000000       /* base of internal resource regs */
#define CS3_ASI        7                /* ASI of internal resource regs  */

// DRAM_BASE2 is defined so that we run the same RAM-sizing code in both
// RAM and ROM startup versions; but the RAM startup one starts RAM sizing
// at 0x043ff000 ie. 4k down from the top of the 4M available.
	
#ifdef CYG_HAL_STARTUP_RAM
#define DRAM_BASE2 DRAM_BASE + 0x00400000 - 0x1000
#else
#define DRAM_BASE2 DRAM_BASE
#endif
	
        .macro led val
        sethi   %hi(LED_ADDR),%l7
        set     \val,%l6
	not	%l6, %l6
        stb     %l6,[%l7 + %lo(LED_ADDR)]
        .endm

	/*
	 * First, setup chip selects.
	 *
	 * NB: The AMR_VAL macro actually inverts the mask bits. For me, it is
	 *     more natural to write a 1 bit where I want the address compared.
	 *     The sparc registers use 0 bits, instead.
	 */
	
	/* -CS0 ADDR_MASK:0xfc000000 ASI_MASK:0xfc */
	set	AMR_VAL(0xfc,0xfc000000),%l0
	mov	AMR0,%l1
	sta	%l0,[%l1] 1
	
	/* -CS1	BASE:0x10000000 ASI:4 */
	set	ARSR_VAL(4,0x10000000),%l0
	mov	ARSR1,%l1
	sta	%l0,[%l1] 1
	/* -CS1 ADDR MASK:0xf0000000 ASI MASK:0x7 */
	set	AMR_VAL(7,0xf0000000),%l0
	mov	AMR1,%l1
	sta	%l0,[%l1] 1
	
	/* -CS2	BASE:0x20000000 ASI:4 */
	set	ARSR_VAL(4,0x20000000), %l0
	mov	ARSR2,%l1
	sta	%l0,[%l1] 1
	/* -CS2 ADDR MASK:0xf0000000 ASI MASK:0x7 */
	set	AMR_VAL(7,0xf0000000),%l0
	mov	AMR2,%l1
	sta	%l0,[%l1] 1
	
	/* -CS3	BASE:CS3_BASE ASI:CS3_ASI */
	set	ARSR_VAL(CS3_ASI,CS3_BASE),%l0
	mov	ARSR3,%l1
	sta	%l0,[%l1] 1
	/* -CS3 ADDR MASK:0xffff0000 ASI MASK:0x7 */
	set	AMR_VAL(7,0xffff0000),%l0
	mov	AMR3,%l1
	sta	%l0,[%l1] 1
	
	/* -CS4 BASE: DRAM_BASE ASI:0xb */
	set	ARSR_VAL(0xb,DRAM_BASE),%l0
	mov	ARSR4,%l1
	sta	%l0,[%l1] 1
	/* -CS4 ADDR MASK:0xfc000000 ASI MASK:0xfc */
	set	AMR_VAL(0xfc,0xfc000000),%l0
	mov	AMR4,%l1
	sta	%l0,[%l1] 1
	
	/* -CS5 BASE:0x30000000 ASI:0xb */
	set	ARSR_VAL(0xb,0x30000000),%l0
	mov	ARSR5,%l1
	sta	%l0,[%l1] 1
	/* -CS5 ADDR MASK:0xfff80000 ASI MASK:0xfc */
	set	AMR_VAL(0xfc,0xfff80000),%l0
	mov	AMR5,%l1
	sta	%l0,[%l1] 1

	
	/*
	 * Setup wait states. Each wait state register sets the wait states for
	 * a pair of chip selects. The lower bits hold the wait state info for
	 * the lower numbered chip select.
	 */

	/* -CS0: 5 wait states,  -CS1: 7 wait states */
//	set	WSSR_VAL(7,7,WSSR_WAITEN,5,5,WSSR_WAITEN),%l0
//	set	WSSR_VAL(4,4,WSSR_WAITEN,5,5,WSSR_WAITEN),%l0 // FOUR -> CS1
	set	WSSR_VAL(10,10,WSSR_WAITEN,5,5,WSSR_WAITEN),%l0 // TEN -> CS1
	mov	WSSR0,%l1
	sta	%l0,[%l1] 1

	/* -CS2: wait states disabled,  -CS3: wait states disabled */
	set	WSSR_VAL(0,0,0,0,0,0),%l0
	mov	WSSR1,%l1
	sta	%l0,[%l1] 1

	/* -CS4: wait states disabled,  -CS5: 0 wait states */
	set	WSSR_VAL(0,0,WSSR_WAITEN|WSSR_OVERRIDE,0,0,0),%l0
	mov	WSSR2,%l1
	sta	%l0,[%l1] 1

	led	0x10

	/* clear cache/BIU control register */
	mov	CBIR,%l1
	sta	%g0,[%l1] 1

	/* Read clock switch to determine the value of the refresh timer */
	sethi	%hi(CLKSW_ADDR),%l1
	ldub	[%l1 + %lo(CLKSW_ADDR)],%l0
	btst	0x80,%l0
	bne,a	1f
	mov	10,%l0		/* force to 10MHz if CLKSW-8 is ON */
    1:
	umul	%l0,15,%l0
	mov	DRLD,%l1
	sta	%l0,[%l1] 1
	mov	REFTMR,%l1
	sta	%l0,[%l1] 1

	/* read SW1 to get DRAM page size */
	sethi	%hi(SW1_ADDR),%l1
	ldub	[%l1 + %lo(SW1_ADDR)],%l0
	btst	0x10,%l0
	be,a	1f
	 mov	0x0e,%l0	/* 1K page if branch taken (SW1-5 is OFF) */
	mov	0x06,%l0	/* 2K page (SW1-5 is OFF) */
    1:
	mov	SPGMR,%l1
	sta	%l0,[%l1] 1

	led	0x20

#ifdef CYG_HAL_STARTUP_ROM
	/* Turn on all system services */	
	mov	SSCR_TIMER|SSCR_WAIT|SSCR_CS|SSCR_SAMEPG,%l0
	mov	SSCR,%l1
	sta	%l0,[%l1] 1
	nop
	nop
	nop
	nop
	
#endif

	led	0x30
	
	/*
	 * Initialize caches.
	 */
	sethi	%hi(0x1000),%l0		/* bank 1 invalidate */
	sethi	%hi(0x80000000),%l1	/* bank 2 invalidate */
	mov	3,%l2			/* clear lock, lru, and valid bits */ 
	sta	%l2,[%l0] 0xc		/* do it - icache bank 1 */
	sta	%l2,[%l0] 0xe		/* do it - dcache bank 1 */
	sta	%l2,[%l0 + %l1] 0xc	/* do it - icache bank 2 */
	sta	%l2,[%l0 + %l1] 0xe	/* do it - dcache bank 2 */
	
	/* now, enable caches and buffers */
	mov	CBIR_ICEN|CBIR_DCEN|CBIR_PBEN|CBIR_WBEN,%l0
	mov	CBIR,%l1
	sta	%l0,[%l1] 1
	nop 
	nop 
	nop 
	nop
	
	/* enable data and insn bursts */
	mov	BCR_IBE|BCR_DBE,%l0
	mov	BCR,%l1
	sta	%l0,[%l1] 1
	nop 
	nop 
	nop 
	nop

	/*
	 * DRAM setup/test.
	 */
	led 0x40

	/*
	 * Test SW1-7 to determine normal or EDO mode.
	 *   SW1-7 ON  = EDO
	 *   SW1-7 OFF = Normal.
	 */
	sethi	%hi(SW1_ADDR),%l1
	ldub	[%l1 + %lo(SW1_ADDR)],%l7
	mov	DBANKR_SA04,%l0		/* DRAM starts at 0x04000000 */
	btst	0x40,%l7
	bne	1f			/* branch if SW1-7 is OFF */
	 mov	SSCR_DRAM,%l1
	/* EDO DRAM, enable burst in SSCR and EDO in DBANKR */
	or	%l1,SSCR_BURST,%l1
	or	%l0,DBANKR_EDO,%l0
    1:
	/*
	 * Now, test SW1 to get DRAM page and bank size.
	 *   SW1-5 ON  = 2k page, 16MB bank. (up to 64MB total)
	 *   SW1-5 OFF = 1k page, 4MB bank.  (up to 16MB total)
	 */
	btst	0x10,%l7
	bne,a	1f				/* branch if OFF */
	or	%l0,DBANKR_4M|DBANKR_CA10,%l0  /* 1K page */
	or	%l0,DBANKR_16M|DBANKR_CA11,%l0 /* 2K page */
    1:
	mov	CS3_BASE+DBANKR,%l2
	sta	%l0,[%l2] CS3_ASI
	
	mov	DTIMR_RPS2|DTIMR_CBR3|DTIMR_CAS2|DTIMR_RP2,%l0
	mov	CS3_BASE+DTIMR,%l2
	sta	%l0,[%l2] CS3_ASI
	
	mov	SSCR,%l2
	lda	[%l2] 1, %l0
	or	%l0,%l1,%l0
	sta	%l0,[%l2] 1

	/*
	 * Test SW1 to get potential DRAM limit.
	 *   SW1-5 ON  = 2k page, up to 64MB total
	 *   SW1-5 OFF = 1k page, up to 16MB total
	 */
	btst	0x10,%l7
	bne,a	1f				/* branch if OFF */
	 sethi	%hi(DRAM_BASE + 16*1024*1024),%l0
	sethi	%hi(DRAM_BASE + 64*1024*1024),%l0
    1:

	/* subtract 4 to get last valid DRAM address */
	add	%l0,-4,%l0
		
	/* Assume maximim memory and fill with pattern */	
	set	DRAM_BASE2,%l2
	set	0xaaaaaaaa,%l3
    1:
	st	%l3,[%l2]
	cmp	%l2,%l0
	blt	1b
	 add	%l2,4,%l2

	/*
	 * Go back, read data and compare with written data.
	 * Fill in with zero as we go along.
	 */
	set	DRAM_BASE2,%l2
    1:
	ld	[%l2],%l4
	cmp	%l4,%l3
	bne	2f
	 st	%g0,[%l2]
	cmp	%l2,%l0
	blt,a	1b
	 add	%l2,4,%l2
    2:
	led	0x50
	
	sub	%l2,64,%i6
	sethi	%hi(DRAM_BASE),%l1
	sub	%l2,%l1,%l0
	st	%l0,[%i6]

// NOTE that here, the frame pointer is set up to the top of RAM minus a
// little bit with the size of RAM at %fp (%i6)

#ifdef CYG_HAL_STARTUP_ROM

	led	0x58
	
	! copy the trampoline code into the base of RAM
	! including the two ~rogue~ instructions...
	.extern .data
	sethi	%hi(.data), %l0		! get the start of RAM
	andn	%l0, 0xfff, %l0
	set	rom_vectors, %l1	! get the start of the trampoline
	set	rom_vectors_end, %l2	! ...and its end.
33:
	ldd	[ %l1 ], %l4		! also uses %l5
	std	%l4, [ %l0 ]
	inc	8, %l1
	inc	8, %l0
	cmp	%l1, %l2
	bl	33b
	 nop

	led	0x59

	sethi	%hi(.data), %g1		! get the start of RAM
	andn	%g1, 0xfff, %g1
	set	real_vector_instructions, %l0
	ld	[ %l0 ], %l1
	st	%l1, [ %g1 ]		! into the vector
	ld	[ %l0 + 4 ], %l1
	st	%l1, [ %g1 + 4 ]	! into the vector

	led	0x5a

	! then invalidate the instruction cache:
	set	3, %l0
	set	0x00001000, %l1
	set	0x80001000, %l2
	sta	%l0, [ %l1 ] 0x0c
	sta	%l0, [ %l2 ] 0x0c

	led	0x5b	
	
	! and the data cache
	sta	%l0, [ %l1 ] 0x0e
	sta	%l0, [ %l2 ] 0x0e
	nop
	nop
	nop
	nop				! should be enough

	led	0x5c
	
	! and (re)set the tbr, finally.
	sethi	%hi(.data), %g1
	andn	%g1, 0xfff, %g1
	wr	%g1, %tbr		! Traps are at RAM start
	nop
	nop
	nop
	
	led	0x5d

#else	

	led	0x5f

#endif // CYG_HAL_STARTUP_ROM

	! turn on caches - copied from the book	
#define	set_size	64
#define ini_tag		0
#define	adr1		0x00000000
#define	adr2		0x80000000
#define step		16
#define CTL_BITS	0x35

	set	set_size, %l7
	set	adr1, %o1
	set	adr2, %o2
	set	ini_tag, %l0
10:
	sta	%l0, [ %o1 ] 0x0c
	sta	%l0, [ %o1 ] 0x0e
	sta	%l0, [ %o2 ] 0x0c
	sta	%l0, [ %o2 ] 0x0e
	add	%o1, step, %o1
	subcc	%l7, 1, %l7
	bne	10b
	add	%o2, step, %o2

	set	0, %l1
	set	CTL_BITS, %l2
	sta	%l2, [ %l1 ] 0x01
	nop
	nop
	nop
	nop	! delay to let caches stabilize
	
	led	0x60

	// Now set up the 86940
	
#define TRGM0	0
#define TRGM1	4	    
#define REQSNS  8
#define REQCLR 12
#define IMASK  16
#define IRLAT  20
#define IMODE  24
	
	sethi	%hi( 0x10000000 ), %l1	! base address of the 86940 companion

	set	0xfffe0000, %l4		! mask all intrs
	add	%l1, IMASK, %l3
	sta	%l4, [ %l3 ] 4
	
	set	0x11400000, %l6		! Channels 14,12,11 into Active Low
	add	%l1, TRGM0, %l3
	sta	%l6, [ %l3 ] 4
	
	set	0x05100000, %l6		! Channels 5,4,2 into Active Low
	add	%l1, TRGM1, %l3
	sta	%l6, [ %l3 ] 4

	add	%l1, REQCLR, %l3	! clear all pending intrs
	sta	%l4, [ %l3 ] 4

	set	0x00100000, %l6		! clear the latch
	add	%l1, IRLAT, %l3
	sta	%l6, [ %l3 ] 4

	nop
	nop
	nop

	led	0x70
	
#endif  /* CYGONCE_HAL_HALBOOT_SI */
/* EOF halboot.si */