2008-08-06 17:15:27 +08:00
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/*
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* Common Blackfin startup code
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*
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* Copyright 2004-2008 Analog Devices Inc.
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/blackfin.h>
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2008-08-06 17:18:31 +08:00
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#include <asm/thread_info.h>
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2008-08-06 17:15:27 +08:00
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#include <asm/trace.h>
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/* A little BF561 glue ... */
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#ifndef WDOG_CTL
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# define WDOG_CTL WDOGA_CTL
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#endif
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__INIT
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ENTRY(_real_start)
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/* Enable nested interrupts */
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[--sp] = reti;
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/* watchdog off for now */
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p0.l = lo(WDOG_CTL);
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p0.h = hi(WDOG_CTL);
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r0 = 0xAD6(z);
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w[p0] = r0;
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ssync;
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/* Zero out the bss region
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* Note: this will fail if bss is 0 bytes ...
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*/
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r0 = 0 (z);
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r1.l = ___bss_start;
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r1.h = ___bss_start;
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r2.l = ___bss_stop;
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r2.h = ___bss_stop;
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r2 = r2 - r1;
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r2 >>= 2;
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p1 = r1;
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p2 = r2;
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lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
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.L_clear_bss:
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[p1++] = r0;
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/* In case there is a NULL pointer reference,
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* zero out region before stext
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*/
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p1 = r0;
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r2.l = __stext;
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r2.h = __stext;
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r2 >>= 2;
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p2 = r2;
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lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
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.L_clear_zero:
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[p1++] = r0;
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/* Pass the u-boot arguments to the global value command line */
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R0 = R7;
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call _cmdline_init;
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/* Load the current thread pointer and stack */
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sp.l = _init_thread_union;
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sp.h = _init_thread_union;
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p1 = THREAD_SIZE (z);
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sp = sp + p1;
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usp = sp;
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fp = sp;
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jump.l _start_kernel;
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ENDPROC(_real_start)
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__FINIT
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