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| author | Michal Simek <monstr@monstr.eu> | 2009-07-30 14:31:23 +0200 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2009-09-21 14:29:21 +0200 |
| commit | 2622434ee0108c65808a63f067e72d0bbc75b372 (patch) | |
| tree | c6f89cd62d636bbdc6e96c589481d79b7b67c3da /arch/microblaze | |
| parent | 8cc11f5ab5384dad6c63905f71882e65cd70b7b7 (diff) | |
| download | kernel_samsung_crespo-2622434ee0108c65808a63f067e72d0bbc75b372.zip kernel_samsung_crespo-2622434ee0108c65808a63f067e72d0bbc75b372.tar.gz kernel_samsung_crespo-2622434ee0108c65808a63f067e72d0bbc75b372.tar.bz2 | |
microblaze: Add checking mechanism for MSR instruction
It was necessary to use fourth parameter(r8) in early_printk
to show messages on console.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
| -rw-r--r-- | arch/microblaze/include/asm/setup.h | 2 | ||||
| -rw-r--r-- | arch/microblaze/kernel/head.S | 17 | ||||
| -rw-r--r-- | arch/microblaze/kernel/setup.c | 12 |
3 files changed, 27 insertions, 4 deletions
diff --git a/arch/microblaze/include/asm/setup.h b/arch/microblaze/include/asm/setup.h index 27f8daf..ed67c9e 100644 --- a/arch/microblaze/include/asm/setup.h +++ b/arch/microblaze/include/asm/setup.h @@ -38,7 +38,7 @@ extern void early_console_reg_tlb_alloc(unsigned int addr); void time_init(void); void init_IRQ(void); void machine_early_init(const char *cmdline, unsigned int ram, - unsigned int fdt); + unsigned int fdt, unsigned int msr); void machine_restart(char *cmd); void machine_shutdown(void); diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S index e41c6ce..bfc7ea8 100644 --- a/arch/microblaze/kernel/head.S +++ b/arch/microblaze/kernel/head.S @@ -55,6 +55,19 @@ ENTRY(_start) andi r1, r1, ~2 mts rmsr, r1 +/* + * Here is checking mechanism which check if Microblaze has msr instructions + * We load msr and compare it with previous r1 value - if is the same, + * msr instructions works if not - cpu don't have them. + */ + or r8, r0, r0 /* 0 - I have msr instr, 1 - I don't have */ + or r12, r0, r0 + msrset r12, 0 /* set nothing - just read msr for test */ + cmpu r12, r12, r1 + beqi r12, 1f + ori r8, r0, 1 /* I don't have msr */ +1: + /* r7 may point to an FDT, or there may be one linked in. if it's in r7, we've got to save it away ASAP. We ensure r7 points to a valid FDT, just in case the bootloader @@ -209,8 +222,8 @@ start_here: * Please see $(ARCH)/mach-$(SUBARCH)/setup.c for * the function. */ - la r8, r0, machine_early_init - brald r15, r8 + la r9, r0, machine_early_init + brald r15, r9 nop #ifndef CONFIG_MMU diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c index 2a97bf5..8c1e0f4 100644 --- a/arch/microblaze/kernel/setup.c +++ b/arch/microblaze/kernel/setup.c @@ -94,7 +94,7 @@ inline unsigned get_romfs_len(unsigned *addr) #endif /* CONFIG_MTD_UCLINUX_EBSS */ void __init machine_early_init(const char *cmdline, unsigned int ram, - unsigned int fdt) + unsigned int fdt, unsigned int msr) { unsigned long *src, *dst = (unsigned long *)0x0; @@ -157,6 +157,16 @@ void __init machine_early_init(const char *cmdline, unsigned int ram, early_printk("New klimit: 0x%08x\n", (unsigned)klimit); #endif +#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR + if (msr) + early_printk("!!!Your kernel has setup MSR instruction but " + "CPU don't have it %d\n", msr); +#else + if (!msr) + early_printk("!!!Your kernel not setup MSR instruction but " + "CPU have it %d\n", msr); +#endif + for (src = __ivt_start; src < __ivt_end; src++, dst++) *dst = *src; |