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[ARM] nommu: manage the CP15 things

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All the current CP15 access codes in ARM arch can be categorized and
conditioned by the defines as follows:

     Related operation	Safe condition
  a. any CP15 access	!CPU_CP15
  b. alignment trap	CPU_CP15_MMU
  c. D-cache(C-bit)	CPU_CP15
  d. I-cache		CPU_CP15 && !( CPU_ARM610 || CPU_ARM710 ||
				CPU_ARM720 || CPU_ARM740 ||
				CPU_XSCALE || CPU_XSC3 )
  e. alternate vector	CPU_CP15 && !CPU_ARM740
  f. TTB		CPU_CP15_MMU
  g. Domain		CPU_CP15_MMU
  h. FSR/FAR		CPU_CP15_MMU

For example, alternate vector is supported if and only if
"CPU_CP15 && !CPU_ARM740" is satisfied.

Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Hyok S. Choi
2006-09-26 17:36:37 +09:00
committed by Russell King
parent fefdaa06cc
commit f12d0d7c77
9 changed files with 60 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm/kernel/head-nommu.S
View File

@ -9,7 +9,6 @@
* published by the Free Software Foundation.
*
* Common kernel startup code (non-paged MM)
* for 32-bit CPUs which has a process ID register(CP15).
*
*/
#include <linux/linkage.h>
@ -40,7 +39,11 @@
ENTRY(stext)
msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | SVC_MODE @ ensure svc mode
@ and irqs disabled
#ifndef CONFIG_CPU_CP15
ldr r9, =CONFIG_PROCESSOR_ID
#else
mrc p15, 0, r9, c0, c0 @ get processor id
#endif
bl __lookup_processor_type @ r5=procinfo r9=cpuid
movs r10, r5 @ invalid processor (r5=0)?
beq __error_p @ yes, error 'p'
@ -58,6 +61,7 @@ ENTRY(stext)
*/
.type __after_proc_init, %function
__after_proc_init:
#ifdef CONFIG_CPU_CP15
mrc p15, 0, r0, c1, c0, 0 @ read control reg
#ifdef CONFIG_ALIGNMENT_TRAP
orr r0, r0, #CR_A
@ -74,6 +78,7 @@ __after_proc_init:
bic r0, r0, #CR_I
#endif
mcr p15, 0, r0, c1, c0, 0 @ write control reg
#endif /* CONFIG_CPU_CP15 */
mov pc, r13 @ clear the BSS and jump
@ to start_kernel

22
arch/arm/kernel/process.c
View File

@ -221,16 +221,26 @@ void __show_regs(struct pt_regs *regs)
processor_modes[processor_mode(regs)],
thumb_mode(regs) ? " (T)" : "",
get_fs() == get_ds() ? "kernel" : "user");
#if CONFIG_CPU_CP15
{
unsigned int ctrl, transbase, dac;
unsigned int ctrl;
__asm__ (
" mrc p15, 0, %0, c1, c0\n"
" mrc p15, 0, %1, c2, c0\n"
" mrc p15, 0, %2, c3, c0\n"
: "=r" (ctrl), "=r" (transbase), "=r" (dac));
printk("Control: %04X Table: %08X DAC: %08X\n",
ctrl, transbase, dac);
: "=r" (ctrl));
printk("Control: %04X\n", ctrl);
}
#ifdef CONFIG_CPU_CP15_MMU
{
unsigned int transbase, dac;
__asm__ (
" mrc p15, 0, %0, c2, c0\n"
" mrc p15, 0, %1, c3, c0\n"
: "=r" (transbase), "=r" (dac));
printk("Table: %08X DAC: %08X\n",
transbase, dac);
}
#endif
#endif
}
void show_regs(struct pt_regs * regs)