3c726f8dee
Adds a new CONFIG_PPC_64K_PAGES which, when enabled, changes the kernel base page size to 64K. The resulting kernel still boots on any hardware. On current machines with 4K pages support only, the kernel will maintain 16 "subpages" for each 64K page transparently. Note that while real 64K capable HW has been tested, the current patch will not enable it yet as such hardware is not released yet, and I'm still verifying with the firmware architects the proper to get the information from the newer hypervisors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
122 lines
1.9 KiB
ArmAsm
122 lines
1.9 KiB
ArmAsm
/*
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* arch/ppc64/lib/copypage.S
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*
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* Copyright (C) 2002 Paul Mackerras, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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_GLOBAL(copy_4K_page)
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std r31,-8(1)
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std r30,-16(1)
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std r29,-24(1)
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std r28,-32(1)
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std r27,-40(1)
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std r26,-48(1)
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std r25,-56(1)
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std r24,-64(1)
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std r23,-72(1)
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std r22,-80(1)
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std r21,-88(1)
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std r20,-96(1)
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li r5,4096/32 - 1
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addi r3,r3,-8
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li r12,5
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0: addi r5,r5,-24
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mtctr r12
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ld r22,640(4)
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ld r21,512(4)
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ld r20,384(4)
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ld r11,256(4)
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ld r9,128(4)
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ld r7,0(4)
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ld r25,648(4)
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ld r24,520(4)
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ld r23,392(4)
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ld r10,264(4)
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ld r8,136(4)
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ldu r6,8(4)
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cmpwi r5,24
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1: std r22,648(3)
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std r21,520(3)
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std r20,392(3)
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std r11,264(3)
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std r9,136(3)
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std r7,8(3)
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ld r28,648(4)
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ld r27,520(4)
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ld r26,392(4)
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ld r31,264(4)
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ld r30,136(4)
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ld r29,8(4)
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std r25,656(3)
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std r24,528(3)
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std r23,400(3)
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std r10,272(3)
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std r8,144(3)
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std r6,16(3)
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ld r22,656(4)
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ld r21,528(4)
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ld r20,400(4)
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ld r11,272(4)
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ld r9,144(4)
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ld r7,16(4)
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std r28,664(3)
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std r27,536(3)
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std r26,408(3)
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std r31,280(3)
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std r30,152(3)
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stdu r29,24(3)
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ld r25,664(4)
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ld r24,536(4)
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ld r23,408(4)
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ld r10,280(4)
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ld r8,152(4)
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ldu r6,24(4)
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bdnz 1b
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std r22,648(3)
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std r21,520(3)
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std r20,392(3)
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std r11,264(3)
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std r9,136(3)
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std r7,8(3)
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addi r4,r4,640
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addi r3,r3,648
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bge 0b
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mtctr r5
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ld r7,0(4)
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ld r8,8(4)
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ldu r9,16(4)
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3: ld r10,8(4)
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std r7,8(3)
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ld r7,16(4)
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std r8,16(3)
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ld r8,24(4)
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std r9,24(3)
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ldu r9,32(4)
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stdu r10,32(3)
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bdnz 3b
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4: ld r10,8(4)
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std r7,8(3)
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std r8,16(3)
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std r9,24(3)
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std r10,32(3)
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9: ld r20,-96(1)
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ld r21,-88(1)
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ld r22,-80(1)
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ld r23,-72(1)
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ld r24,-64(1)
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ld r25,-56(1)
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ld r26,-48(1)
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ld r27,-40(1)
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ld r28,-32(1)
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ld r29,-24(1)
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ld r30,-16(1)
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ld r31,-8(1)
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blr
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