/*
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/*
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* FILE: head.c
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* FILE: head.c
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* AUTHOR: kma
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* AUTHOR: kma
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* DESCR: Initialization code for the i960.
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* DESCR: Initialization code for the i960.
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*/
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*/
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#ident "$Id: head.c,v 1.1 2005-12-20 09:42:38 jcastillo Exp $"
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#ident "$Id: head.c,v 1.1 2005-12-20 09:42:38 jcastillo Exp $"
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#include <linux/autoconf.h>
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#include <linux/autoconf.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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/*
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/*
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* So here we are! Running at ipl 31, in supervisor mode, on mon960's user
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* So here we are! Running at ipl 31, in supervisor mode, on mon960's user
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* stack. Do we need to do much here? Let's just get right into start_kernel.
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* stack. Do we need to do much here? Let's just get right into start_kernel.
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*/
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*/
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int main(void)
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int main(void)
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{
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{
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long oldac;
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long oldac;
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extern void start_kernel(void);
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extern void start_kernel(void);
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/* 64-bit math routines need the overflow mask bit set */
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/* 64-bit math routines need the overflow mask bit set */
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__asm__ __volatile__
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__asm__ __volatile__
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("modac %1, %1, %1" : "=r"(oldac) : "0"(1 << 12));
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("modac %1, %1, %1" : "=r"(oldac) : "0"(1 << 12));
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/* Make the i960 think it's in an interrupt handler. This has the effect
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/* Make the i960 think it's in an interrupt handler. This has the effect
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* of not switching to the interrupt stack for every interrupt. Of
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* of not switching to the interrupt stack for every interrupt. Of
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* course, we wouldn't need this if there were a sensible way of
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* course, we wouldn't need this if there were a sensible way of
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* specifying an interrupt stack short of reinitializing the CPU, but
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* specifying an interrupt stack short of reinitializing the CPU, but
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* such is life.
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* such is life.
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*
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*
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* XXX: this has the effect of using user stacks for interrupts too.
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* XXX: this has the effect of using user stacks for interrupts too.
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* The world's a scary place.
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* The world's a scary place.
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*/
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*/
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__asm__ __volatile__ ("modpc %1, %1, %1" : "=r"(oldac) : "0"(1<<13));
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__asm__ __volatile__ ("modpc %1, %1, %1" : "=r"(oldac) : "0"(1<<13));
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#ifdef CONFIG_CMDLINE_PROMPT
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#ifdef CONFIG_CMDLINE_PROMPT
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/* do crazy command-line obtainments... */
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/* do crazy command-line obtainments... */
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#endif
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#endif
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start_kernel();
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start_kernel();
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printk("XXX: start_kernel returned!!!\n");
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printk("XXX: start_kernel returned!!!\n");
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for(;;) ;
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for(;;) ;
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}
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}
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