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For old CPUs, map the 64 first MB of RAM as it used to be. Some ports

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(XScale mainly) expects the memory located before the kernel to be mapped,
and use it to allocate the page tables, the various stacks, etc.
A better fix would probably be to rewrite the various bla_machdep.c to stop
using that RAM, but I'm not so inclined to do it, especially since I don't
have hardware for all of them.
This commit is contained in:
cognet 2014-05-29 16:54:15 +00:00
parent f2f42aa2cf
commit 4aa25df8dd
1 changed files with 25 additions and 1 deletions
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26
sys/arm/arm/locore.S
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@ -166,9 +166,32 @@ Lunmapped:
ldr r1, [r0, #4]
sub r0, r1, r2
#ifndef _ARM_ARCH_6
/*
* Some of the older ports (the various XScale, mostly) assume
* that the memory before the kernel is mapped, and use it for
* the various stacks, page tables, etc. For those CPUs, map the
* 64 first MB of RAM, as it used to be.
*/
/*
* Map PA == VA
*/
*/
ldr r5, =PHYSADDR
mov r1, r5
mov r2, r5
/* Map 64MiB, preserved over calls to build_pagetables */
mov r3, #64
bl build_pagetables
/* Create the kernel map to jump to */
mov r1, r5
ldr r2, =(KERNBASE)
bl build_pagetables
ldr r5, =(KERNPHYSADDR)
#else
/*
* Map PA == VA
*/
/* Find the start kernels load address */
adr r5, _start
ldr r2, =(L1_S_OFFSET)
@ -183,6 +206,7 @@ Lunmapped:
mov r1, r5
ldr r2, =(KERNVIRTADDR)
bl build_pagetables
#endif
#if defined(SOCDEV_PA) && defined(SOCDEV_VA)
/* Create the custom map */