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138 lines
2.9 KiB
138 lines
2.9 KiB
#!/usr/bin/perl
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my ($myedata,$myend,$initmips,$mystart);
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open(F,qq(objdump -x $ARGV[0]|));
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while(<F>)
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{
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chomp;
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if(/([0-9a-f]+).+_edata/){
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$myedata=qq(0x$1);
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}
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if(/([0-9a-f]+).+_end$/){
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$myend=qq(0x$1);
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}
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if(/([0-9a-f]+).+initmips$/){
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$myinitmips=qq(0x$1);
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}
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if(/([0-9a-f]+).+\s_start$/){
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$mystart=qq(0x$1);
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}
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}
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printf(<< "END"
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void stringserial(char *msg);
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void realinitmips(unsigned int msize);
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void enable_cache()
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{
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__asm__ volatile(
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".set mips2;\\n" \\
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" mfc0 \$4,\$16;\\n" \\
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" and \$4,\$4,0xfffffff8;\\n" \\
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" or \$4,\$4,0x3;\\n" \\
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" mtc0 \$4,\$16;\\n" \\
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" .set mips0;\\n"
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::
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:"\$4"
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);
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}
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#ifndef NOCACHE2
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void flush_cache2()
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{
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asm volatile(\
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" mfc0 \$3, \$15; # read processor ID register;\\n" \\
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" li \$2, 0x6303; #godson2f prid;\\n" \\
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" beq \$2, \$3, godson_2f;\\n" \\
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" nop;\\n" \\
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" li \$2, 0x6302; #godson2e prid;\\n" \\
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" bne \$2, \$3,11f ;\\n" \\
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" nop;\\n" \\
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"# godson2e;\\n" \\
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" godson_2f: " \\
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" li \$2, 0x80000000;\\n" \\
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" addu \$3,\$2,512*1024;\\n" \\
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"10:\\n" \\
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" cache 3, 0(\$2);\\n" \\
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" cache 3, 1(\$2);\\n" \\
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" cache 3, 2(\$2);\\n" \\
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" cache 3, 3(\$2);\\n" \\
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" addu \$2, 32;\\n" \\
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" bne \$2,\$3, 10b;\\n" \\
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" nop;\\n" \\
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"11:\\n" \\
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:::"\$2","\$3"
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);
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}
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#else
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void flush_cache()
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{
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#ifndef WAYBIT
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#define WAYBIT 0
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#endif
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#define WAY__(x) #x
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#define WAY_(x,y) WAY__((x<<y))
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#define WAY(x) WAY_(x,WAYBIT)
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asm volatile(\
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" .set mips3;\\n" \\
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" li \$5,0x80000000;\\n" \\
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" addu \$6,\$5,16384;\\n" \\
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"1:\\n" \\
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" cache 1," WAY(0) "(\$5);\\n" \\
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" cache 1," WAY(1) "(\$5);\\n" \\
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" cache 1," WAY(2) "(\$5);\\n" \\
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" cache 1," WAY(3) "(\$5);\\n" \\
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" cache 0," WAY(0) "(\$5);\\n" \\
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" cache 0," WAY(1) "(\$5);\\n" \\
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" cache 0," WAY(2) "(\$5);\\n" \\
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" cache 0," WAY(3) "(\$5);\\n" \\
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" add \$5,\$5,32;\\n" \\
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" bne \$5,\$6,1b;\\n" \\
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" nop;\\n" \\
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" .set mips0;\\n" \\
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::: "\$5","\$6");
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}
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#endif
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void initmips(unsigned int msize,int dmsize,int dctrl)
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{
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long *edata=(void *)$myedata;
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long *end=(void *)$myend;
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long *p;
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int debug=(msize==0);
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CPU_TLBClear();
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stringserial("Uncompressing Bios");
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if(!debug||dctrl&1)enable_cache();
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while(1)
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{
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if(run_unzip(biosdata,$mystart)>=0)break;
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}
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stringserial("OK,Booting Bios\\r\\n");
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for(p=edata;p<=end;p++)
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{
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*p=0;
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}
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memset($mystart-0x1000,0,0x1000);//$mystart-0x1000 for frame(registers),memset for pretty
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#ifdef NOCACHE2
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flush_cache();
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#else
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flush_cache2();
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#endif
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realinitmips(debug?dmsize:msize);
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}
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void realinitmips(unsigned int msize)
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{
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asm ("li \$29,$mystart-0x4000;\\n" \\
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" li \$2,$myinitmips;\\n" \\
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" move \$4,\%0;\\n" \\
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" mtc0 \$2,\$24;\\n" \\
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" .word 0x4200001f;\\n" \\
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" nop;\\n" \\
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" 1: b 1b;nop;\\n" \\
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:
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: "r" (msize)
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: "\$29", "\$2","\$4");
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}
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END
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);
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