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- /*
- * linux/arch/arm/lib/copypage-xsc3.S
- *
- * Copyright (C) 2004 Intel Corp.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Adapted for 3rd gen XScale core, no more mini-dcache
- * Author: Matt Gilbert (matthew.m.gilbert@intel.com)
- */
- #include <linux/linkage.h>
- #include <linux/init.h>
- #include <asm/asm-offsets.h>
- /*
- * General note:
- * We don't really want write-allocate cache behaviour for these functions
- * since that will just eat through 8K of the cache.
- */
- .text
- .align 5
- /*
- * XSC3 optimised copy_user_page
- * r0 = destination
- * r1 = source
- * r2 = virtual user address of ultimate destination page
- *
- * The source page may have some clean entries in the cache already, but we
- * can safely ignore them - break_cow() will flush them out of the cache
- * if we eventually end up using our copied page.
- *
- */
- ENTRY(xsc3_mc_copy_user_page)
- stmfd sp!, {r4, r5, lr}
- mov lr, #PAGE_SZ/64-1
- pld [r1, #0]
- pld [r1, #32]
- 1: pld [r1, #64]
- pld [r1, #96]
- 2: ldrd r2, [r1], #8
- mov ip, r0
- ldrd r4, [r1], #8
- mcr p15, 0, ip, c7, c6, 1 @ invalidate
- strd r2, [r0], #8
- ldrd r2, [r1], #8
- strd r4, [r0], #8
- ldrd r4, [r1], #8
- strd r2, [r0], #8
- strd r4, [r0], #8
- ldrd r2, [r1], #8
- mov ip, r0
- ldrd r4, [r1], #8
- mcr p15, 0, ip, c7, c6, 1 @ invalidate
- strd r2, [r0], #8
- ldrd r2, [r1], #8
- subs lr, lr, #1
- strd r4, [r0], #8
- ldrd r4, [r1], #8
- strd r2, [r0], #8
- strd r4, [r0], #8
- bgt 1b
- beq 2b
- ldmfd sp!, {r4, r5, pc}
- .align 5
- /*
- * XScale optimised clear_user_page
- * r0 = destination
- * r1 = virtual user address of ultimate destination page
- */
- ENTRY(xsc3_mc_clear_user_page)
- mov r1, #PAGE_SZ/32
- mov r2, #0
- mov r3, #0
- 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate line
- strd r2, [r0], #8
- strd r2, [r0], #8
- strd r2, [r0], #8
- strd r2, [r0], #8
- subs r1, r1, #1
- bne 1b
- mov pc, lr
- __INITDATA
- .type xsc3_mc_user_fns, #object
- ENTRY(xsc3_mc_user_fns)
- .long xsc3_mc_clear_user_page
- .long xsc3_mc_copy_user_page
- .size xsc3_mc_user_fns, . - xsc3_mc_user_fns
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