X-Git-Url: https://git.archive.openwrt.org/?p=openwrt.git;a=blobdiff_plain;f=target%2Fimage%2Fgeneric%2Flzma-loader%2Fsrc%2Fstart.S;fp=target%2Fimage%2Fgeneric%2Flzma-loader%2Fsrc%2Fstart.S;h=9a85c4c3572f8fa66aa8750f651b20224953e9df;hp=0000000000000000000000000000000000000000;hb=a8de4fb9f24fea095e80a3fcd5c69bd6029e39d2;hpb=b0107120a73002d99673d1ce0ea22dc9c646472e

diff --git a/target/image/generic/lzma-loader/src/start.S b/target/image/generic/lzma-loader/src/start.S
new file mode 100644
index 0000000000..9a85c4c357
--- /dev/null
+++ b/target/image/generic/lzma-loader/src/start.S
@@ -0,0 +1,160 @@
+#include <asm/asm.h>
+#include <asm/regdef.h>
+
+#define KSEG0		0x80000000
+
+#define C0_CONFIG	$16
+#define C0_TAGLO	$28
+#define C0_TAGHI	$29
+
+#define	CONF1_DA_SHIFT	7			/* D$ associativity */
+#define CONF1_DA_MASK	0x00000380
+#define CONF1_DA_BASE	1
+#define CONF1_DL_SHIFT	10			/* D$ line size */
+#define CONF1_DL_MASK	0x00001c00
+#define CONF1_DL_BASE	2
+#define CONF1_DS_SHIFT	13			/* D$ sets/way */
+#define CONF1_DS_MASK	0x0000e000
+#define CONF1_DS_BASE	64
+#define CONF1_IA_SHIFT	16			/* I$ associativity */
+#define CONF1_IA_MASK	0x00070000
+#define CONF1_IA_BASE	1
+#define CONF1_IL_SHIFT	19			/* I$ line size */
+#define CONF1_IL_MASK	0x00380000
+#define CONF1_IL_BASE	2
+#define CONF1_IS_SHIFT	22			/* Instruction cache sets/way */
+#define CONF1_IS_MASK	0x01c00000
+#define CONF1_IS_BASE	64
+
+#define Index_Invalidate_I	0x00
+#define Index_Writeback_Inv_D   0x01
+
+LEAF(_start)
+	
+	.set	mips32
+	.set noreorder
+
+	/* save argument registers */
+	move t4, a0
+	move t5, a1
+	move t6, a2
+	move t7, a3
+	
+	/* set up stack */
+	li	sp, 0xa0000000 + RAMSIZE - 16
+
+#ifdef IMAGE_COPY
+	/* Copy decompressor code to the right place */
+	li  t2, LOADADDR
+	add a0, t2, 0
+	la  a1, code_start
+	la  a2, code_stop
+$L1:
+	lw  t0, 0(a1)
+	sw  t0, 0(a0)
+	add a1, 4
+	add a0, 4
+	blt a1, a2, $L1
+	nop
+#endif
+
+	/* At this point we need to invalidate dcache and */
+	/* icache before jumping to new code */
+
+1:	/* Get cache sizes */
+	mfc0	s0,C0_CONFIG,1
+
+	li	s1,CONF1_DL_MASK
+	and	s1,s0
+	beq	s1,zero,nodc
+	nop
+
+	srl	s1,CONF1_DL_SHIFT
+	li	t0,CONF1_DL_BASE
+	sll	s1,t0,s1		/* s1 has D$ cache line size */
+
+	li	s2,CONF1_DA_MASK
+	and	s2,s0
+	srl	s2,CONF1_DA_SHIFT
+	addiu	s2,CONF1_DA_BASE	/* s2 now has D$ associativity */
+
+	li	t0,CONF1_DS_MASK
+	and	t0,s0
+	srl	t0,CONF1_DS_SHIFT
+	li	s3,CONF1_DS_BASE
+	sll	s3,s3,t0		/* s3 has D$ sets per way */
+
+	multu	s2,s3			/* sets/way * associativity */
+	mflo	t0			/* total cache lines */
+
+	multu	s1,t0			/* D$ linesize * lines */
+	mflo	s2			/* s2 is now D$ size in bytes */
+
+	/* Initilize the D$: */
+	mtc0	zero,C0_TAGLO
+	mtc0	zero,C0_TAGHI
+
+	li	t0,KSEG0		/* Just an address for the first $ line */
+	addu	t1,t0,s2		/*  + size of cache == end */
+
+1:	cache	Index_Writeback_Inv_D,0(t0)
+	bne	t0,t1,1b
+	addu	t0,s1
+	
+nodc:
+	/* Now we get to do it all again for the I$ */
+	
+	move	s3,zero			/* just in case there is no icache */
+	move	s4,zero
+
+	li	t0,CONF1_IL_MASK
+	and	t0,s0
+	beq	t0,zero,noic
+	nop
+
+	srl	t0,CONF1_IL_SHIFT
+	li	s3,CONF1_IL_BASE
+	sll	s3,t0			/* s3 has I$ cache line size */
+
+	li	t0,CONF1_IA_MASK
+	and	t0,s0
+	srl	t0,CONF1_IA_SHIFT
+	addiu	s4,t0,CONF1_IA_BASE	/* s4 now has I$ associativity */
+
+	li	t0,CONF1_IS_MASK
+	and	t0,s0
+	srl	t0,CONF1_IS_SHIFT
+	li	s5,CONF1_IS_BASE
+	sll	s5,t0			/* s5 has I$ sets per way */
+
+	multu	s4,s5			/* sets/way * associativity */
+	mflo	t0			/* s4 is now total cache lines */
+
+	multu	s3,t0			/* I$ linesize * lines */
+	mflo	s4			/* s4 is cache size in bytes */
+
+	/* Initilize the I$: */
+	mtc0	zero,C0_TAGLO
+	mtc0	zero,C0_TAGHI
+
+	li	t0,KSEG0		/* Just an address for the first $ line */
+	addu	t1,t0,s4		/*  + size of cache == end */
+
+1:	cache	Index_Invalidate_I,0(t0)
+	bne	t0,t1,1b
+	addu	t0,s3
+noic:
+	/* jump to main */
+	move    a0,s3                   /* icache line size */
+	move    a1,s4                   /* icache size */
+	move    a2,s1                   /* dcache line size */
+#ifdef IMAGE_COPY
+	jal		t2
+#else
+	jal     entry
+#endif
+	move    a3,s2                   /* dcache size */
+
+	.set reorder
+END(_start)
+