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We shouldn't trust the TOS, but for now use the cookie jar to find the cpu type and if it has lpstop.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23461 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
François Revol 2008-01-12 23:56:47 +00:00
parent 416458e9c4
commit 89f97fe903
1 changed files with 16 additions and 13 deletions
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29
src/system/boot/platform/atari_m68k/cpu.cpp
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@ -8,6 +8,7 @@
#include "cpu.h"
#include "toscalls.h"
#include <OS.h>
#include <boot/platform.h>
@ -28,16 +29,23 @@
# define TRACE(x) ;
#endif
bool gCpuHasLPSTOP = false;
static status_t
check_cpu_features()
{
#warning M68K: check for LPSTOP
if (false)
gCpuHasLPSTOP = true;
#warning M68K: TODO: probe ourselves, we shouldn't trust the TOS!
#warning M68K: check for >= 020
const tos_cookie *c = tos_find_cookie('_CPU');
if (!c) {
panic("can't get a cookie (_CPU)! Mum, I'm hungry!");
return EINVAL;
}
#warning M68K: check for 020 + mmu
if (c->ivalue < 30/*20*/)
return EINVAL;
gKernelArgs.arch_args.has_lpstop = (c->ivalue >= 60)?true:false;
#warning M68K: add cpu type to kern args
return B_OK;
}
@ -50,13 +58,8 @@ extern "C" void
spin(bigtime_t microseconds)
{
bigtime_t time = system_time();
if (gCpuHasLPSTOP) {
while ((system_time() - time) < microseconds)
asm volatile ("nop;");//asm volatile ("lpstop;");
} else {
while ((system_time() - time) < microseconds)
asm volatile ("nop;");
}
while ((system_time() - time) < microseconds)
asm volatile ("nop;");
}