diff options
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/kernel/entry-armv.S | 12 | ||||
-rw-r--r-- | arch/arm/kernel/time.c | 13 | ||||
-rw-r--r-- | arch/arm/kernel/traps.c | 1 | ||||
-rw-r--r-- | arch/arm/mm/flush.c | 39 |
4 files changed, 61 insertions, 4 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 2db42b1..8517c3c 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -436,7 +436,7 @@ __und_usr: usr_entry tst r3, #PSR_T_BIT @ Thumb mode? - bne fpundefinstr @ ignore FP + bne __und_usr_unknown @ ignore FP sub r4, r2, #4 @ @@ -448,7 +448,7 @@ __und_usr: @ 1: ldrt r0, [r4] adr r9, ret_from_exception - adr lr, fpundefinstr + adr lr, __und_usr_unknown @ @ fallthrough to call_fpe @ @@ -476,7 +476,9 @@ __und_usr: * Emulators may wish to make use of the following registers: * r0 = instruction opcode. * r2 = PC+4 + * r9 = normal "successful" return address * r10 = this threads thread_info structure. + * lr = unrecognised instruction return address */ call_fpe: tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27 @@ -545,10 +547,12 @@ do_fpe: .data ENTRY(fp_enter) - .word fpundefinstr + .word no_fp .text -fpundefinstr: +no_fp: mov pc, lr + +__und_usr_unknown: mov r0, sp adr lr, ret_from_exception b do_undefinstr diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c index 6ff5e3f..3c8cdcf 100644 --- a/arch/arm/kernel/time.c +++ b/arch/arm/kernel/time.c @@ -29,6 +29,8 @@ #include <linux/timer.h> #include <linux/irq.h> +#include <linux/mc146818rtc.h> + #include <asm/leds.h> #include <asm/thread_info.h> #include <asm/mach/time.h> @@ -85,6 +87,17 @@ unsigned long long __attribute__((weak)) sched_clock(void) return (unsigned long long)jiffies * (1000000000 / HZ); } +/* + * An implementation of printk_clock() independent from + * sched_clock(). This avoids non-bootable kernels when + * printk_clock is enabled. + */ +unsigned long long printk_clock(void) +{ + return (unsigned long long)(jiffies - INITIAL_JIFFIES) * + (1000000000 / HZ); +} + static unsigned long next_rtc_update; /* diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 042a129..9089156 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -27,6 +27,7 @@ #include <asm/uaccess.h> #include <asm/unistd.h> #include <asm/traps.h> +#include <asm/io.h> #include "ptrace.h" #include "signal.h" diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index 628348c..9df507d 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -202,3 +202,42 @@ void flush_dcache_page(struct page *page) } } EXPORT_SYMBOL(flush_dcache_page); + +/* + * Flush an anonymous page so that users of get_user_pages() + * can safely access the data. The expected sequence is: + * + * get_user_pages() + * -> flush_anon_page + * memcpy() to/from page + * if written to page, flush_dcache_page() + */ +void __flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) +{ + unsigned long pfn; + + /* VIPT non-aliasing caches need do nothing */ + if (cache_is_vipt_nonaliasing()) + return; + + /* + * Write back and invalidate userspace mapping. + */ + pfn = page_to_pfn(page); + if (cache_is_vivt()) { + flush_cache_page(vma, vmaddr, pfn); + } else { + /* + * For aliasing VIPT, we can flush an alias of the + * userspace address only. + */ + flush_pfn_alias(pfn, vmaddr); + } + + /* + * Invalidate kernel mapping. No data should be contained + * in this mapping of the page. FIXME: this is overkill + * since we actually ask for a write-back and invalidate. + */ + __cpuc_flush_dcache_page(page_address(page)); +} |