platform.inc

eCos操作系统源码

	# plant a pointer to the interrupt VSR handler in the
	# correct vsr table slot. Leave the rest for the monitor.

	.macro	hal_mon_init_vsr_table
	la	v0,__default_interrupt_vsr
	la	v1,hal_vsr_table
	sw	v0,(0*4)(v1)

	# plant a pointer to our own bus error handler. See the
	# comments in platform.S.
	.extern	hal_bus_error_vsr
	la	v0,hal_bus_error_vsr
	sw	v0,(7*4)(v1)

	.endm

#else
	# The other_vector trampoline is already installed as part of
	# the executable image. However, the TLB exception is, in RAM
	# in the analogous place to the reset vector in ROM. In a
	# ROM or ROMRAM startup we need to copy it into place.

#if defined(CYG_HAL_STARTUP_ROM) || defined(CYG_HAL_STARTUP_ROMRAM)
	.macro	hal_mon_copy_trampoline
	la	a0,utlb_vector
	la	a1,utlb_vector_end
	la	t0,0xa0000000
1:
	lw	v0,0(a0)
	sw	v0,0(t0)
	sw	v0,0x80(t0)
	addiu	a0,a0,4
	bne	a0,a1,1b
	addiu	t0,t0,4
#if defined(CYG_HAL_STARTUP_ROM)
	la	a0,other_vector
	la	a1,other_vector_end
	la	t0,0xa0000180
1:
	lw	v0,0(a0)
	sw	v0,0(t0)
	addiu	a0,a0,4
	bne	a0,a1,1b
	addiu	t0,t0,4
#endif
	.endm
#else
	.macro	hal_mon_copy_trampoline
	.endm
#endif

	# Fill the VSR table with the default VSRs.
	# If we contain the stubs, the default VSR will pass
	# exceptions on to the stubs.

	.macro	hal_mon_init_vsr_table
	la	v0,__default_exception_vsr
	la	v1,hal_vsr_table

	sw	v0,(1*4)(v1)
	sw	v0,(2*4)(v1)
	sw	v0,(3*4)(v1)
	sw	v0,(4*4)(v1)
	sw	v0,(5*4)(v1)
	sw	v0,(6*4)(v1)
#	sw	v0,(7*4)(v1)	# Bus error
	sw	v0,(8*4)(v1)
	sw	v0,(9*4)(v1)
	sw	v0,(10*4)(v1)
	sw	v0,(11*4)(v1)
	sw	v0,(12*4)(v1)
	sw	v0,(13*4)(v1)
	sw	v0,(14*4)(v1)
	sw	v0,(15*4)(v1)
	sw	v0,(23*4)(v1)
	sw	v0,(24*4)(v1)
#	sw	v0,(32*4)(v1)	# debug
	sw	v0,(33*4)(v1)	# utlb
	sw	v0,(34*4)(v1)	# nmi

	la	v0,__default_interrupt_vsr
	sw	v0,(0*4)(v1)

	# plant a pointer to our own bus error handler. See the
	# comments in platform.S.
	.extern	hal_bus_error_vsr
	la	v0,hal_bus_error_vsr
	sw	v0,(7*4)(v1)

	.endm

#endif


#define CYGPKG_HAL_MIPS_MON_DEFINED

#endif	

#------------------------------------------------------------------------------
# Diagnostic macros


#ifndef CYGPKG_HAL_MIPS_DIAG_DEFINED

#if 0

	# This code generates characters and hex values to a
	# Grammar Engine PromICE AI interface.

#define AILOC	0xbfc70000

	.macro	hal_diag_init
	la	v0,AILOC
1:	
	lbu	v1,3(v0)
	nop ; nop ; nop
	subu	v1,0xCC
	beqz	v1,1b
	nop
	lbu	v1,2(v0)

	b	9f
	nop

	.global	hal_diag_ai_write_char
hal_diag_ai_write_char:	

	.set	noat
	la	v0,AILOC	# v0 = AI location
		
1:
	lbu	v1,3(v0)	# v1 = status register
	nop ; nop ; nop
	andi	v1,v1,1		# v1 = TDA bit
	bnez	v1,1b		# loop while non-zero
	nop
	
	sll	a0,a0,1		# a0 = a0<<1
	ori	a0,a0,0x0201	# or in start and stop bits
	li	$at,10		# we have 10 bits to send
2:
	andi	v1,a0,1		# v1 = ls bit of char
	add	v1,v0,v1	# v1 = address of ZERO or ONE register
	lbu	zero,0(v1)	# read it to send bit
	la	v1,100		# delay a bit to let PROMICE deal with it
3:	bnez	v1,3b		# loop while non-zero
	add	v1,v1,-1	# decrement in delay slot
	srl	a0,a0,1		# a0 = a0>>1
	subu	$at,1		# decrement count
	bnez	$at,2b		# loop while non-zero
	nop

	jr	ra		# all done, return
	nop

	.set	at

	.global hal_diag_ai_write_hex1
hal_diag_ai_write_hex1:
	la	v0,9
	andi	a0,a0,0xf
	ble	a0,v0,1f
	nop
	addi	a0,a0,('A'-'9'-1)
1:	addi	a0,a0,'0'
	b	hal_diag_ai_write_char
	nop

	.global hal_diag_ai_write_hex2
hal_diag_ai_write_hex2:
	move	t0,ra		# save ra
	move	t1,a0		# save arg
	srl	a0,a0,4		# ms nibble
	
	bal	hal_diag_ai_write_hex1
	nop
	
	move	a0,t1		# retrieve a0
	move	ra,t0		# retrieve ra
	b	hal_diag_ai_write_hex1
	nop

	.global hal_diag_ai_write_hex4
hal_diag_ai_write_hex4:
	move	t2,ra		# save ra
	move	t3,a0		# save arg
	srl	a0,a0,8		# ms byte
	
	bal	hal_diag_ai_write_hex2
	nop
	
	move	a0,t3		# retrieve a0
	move	ra,t2		# retrieve ra
	b	hal_diag_ai_write_hex2
	nop


	.global hal_diag_ai_write_hex8
hal_diag_ai_write_hex8:
	move	t4,ra		# save ra
	move	t5,a0		# save arg
	srl	a0,a0,16	# ms short
	
	bal	hal_diag_ai_write_hex4
	nop
	
	move	a0,t5		# retrieve a0
	move	ra,t4		# retrieve ra
	b	hal_diag_ai_write_hex4
	nop

	
9:
	# Output a '!' to check that the interface is working

	li	a0,'!'
	bal	hal_diag_ai_write_char
	nop

	.endm

	# Utility macro to emit a character
	.macro	hal_diag_writec char
	.extern hal_diag_ai_write_char
	la	a0,\char
	lar	v0,hal_diag_ai_write_char
	jalr	v0
#	bal	hal_diag_ai_write_char
	nop
	.endm

#if 0
	# This macro outputs a '+', the exception number as a
	# character offset from 'A' and the exception address
	# in hex.
	.macro	hal_diag_excpt_start
	hal_diag_writec '+'
	srl	k0,k0,2
	addi	a0,k0,'A'
	jal	hal_diag_ai_write_char
	nop
	move	a0,t6			# we know t6 contains the epc value
	jal	hal_diag_ai_write_hex8
	nop
	.endm
#else
	.macro	hal_diag_excpt_start
	.endm
#endif

#if 0
	# This macro outputs a '=' and the vector number as a
	# character offset from 'A'.
	.macro	hal_diag_intr_start
	.extern hal_diag_ai_write_char
	hal_diag_writec '='
	addi	a0,s2,'A'
	jal	hal_diag_ai_write_char
	nop
	.endm
#else
	.macro	hal_diag_intr_start
	.endm
#endif

#if 0
	.macro	hal_diag_restore
	hal_diag_writec '^'
	lw	a0,mipsreg_pc(sp)
	lar	k0,hal_diag_ai_write_hex8
	jalr	k0
	.endm
#else
	.macro	hal_diag_restore
	.endm
#endif

#define CYGPKG_HAL_MIPS_DIAG_DEFINED
		
#elif 0

#define DELAY(n) \
        li      $at,n;		\
9:	bnez    $at,9b;	 	\
        subu    $at,1; 		\

 /* Zilog Access Delay */
#define DELZ 		DELAY( (200) )


	.macro	hal_diag_init
	la	v0,0xc2000000
	DELZ
	lbu	v1,8(v0)
	andi	v1,v1,0xfc
	DELZ
	sb	v1,8(v0)
	.endm

	.macro	hal_diag_excpt_start
	.endm

	.macro	hal_diag_intr_start
	la	v0,0xc2000000
	DELZ
	lbu	v1,8(v0)
	xori	v1,v1,0x01
	DELZ
	sb	v1,8(v0)
	.endm

	.macro	hal_diag_restore
	la	v0,0xc2000000
	DELZ
	lbu	v1,8(v0)
	xori	v1,v1,0x01
	DELZ
	sb	v1,8(v0)

#	li	a0,0x0310			# a0 = type = INTR,RAISE
#	lw	a1,mipsreg_sr(sp)		# a1 = sr
#	mfc0	a2,status
#	jal	cyg_instrument			# call instrument function
#	nop

	.endm

#define CYGPKG_HAL_MIPS_DIAG_DEFINED


#endif

#endif	



#------------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_PLATFORM_INC
# end of platform.inc