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Update a comment to reflect ARM ARMv7

This commit is contained in:
skrll 2014-10-29 10:59:48 +00:00
parent cf50862983
commit cec24f163a
1 changed files with 20 additions and 22 deletions
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42
sys/arch/arm/include/arm32/pte.h
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@ -1,4 +1,4 @@
/* $NetBSD: pte.h,v 1.18 2014/08/08 07:47:24 skrll Exp $ */
/* $NetBSD: pte.h,v 1.19 2014/10/29 10:59:48 skrll Exp $ */
/*
* Copyright (c) 2001, 2002 Wasabi Systems, Inc.
@ -304,34 +304,32 @@ typedef uint32_t pt_entry_t; /* L2 table entry */
/*
* Type Extension bits for ARM V6 and V7 MMU
*
* TEX C B Shared
* 000 0 0 Strong order yes
* 000 0 1 Shared device yes
* 000 1 0 write through, no write alloc S-bit
* 000 1 1 write back, no write alloc S-bit
* 001 0 0 non-cacheable S-bit
* TEX C B Shared
* 000 0 0 Strong order yes
* 000 0 1 Shared device yes
* 000 1 0 Outer and Inner write through, no write alloc S-bit
* 000 1 1 Outer and Inner write back, no write alloc S-bit
* 001 0 0 Outer and Inner non-cacheable S-bit
* 001 0 1 reserved
* 001 1 0 reserved
* 001 1 1 write back, write alloc S-bit
* 010 0 0 Non-shared device no
* 001 1 1 Outer and Inner write back, write alloc S-bit
* 010 0 0 Non-shared device no
* 010 0 1 reserved
* 010 1 X reserved
* 011 X X reserved
* 1BB A A BB for internal, AA for external S-bit
* 1BB A A BB for inner, AA for outer S-bit
*
* BB internal cache
* 0 0 Non-cacheable non-buffered
* 0 1 Write back, write alloc, buffered
* 1 0 Write through, no write alloc, buffered
* (non-cacheable for MPCore)
* 1 1 Write back, no write alloc, buffered
* (write back, write alloc for MPCore)
* BB inner cache
* 0 0 Non-cacheable
* 0 1 Write back, write alloc
* 1 0 Write through, no write alloc
* 1 1 Write back, no write alloc
*
* AA external cache
* 0 0 Non-cacheable non-buffered
* 0 1 Write back, write alloc, buffered
* 1 0 Write through, no write alloc, buffered
* 1 1 Write back, no write alloc, buffered
* AA outer cache
* 0 0 Non-cacheable
* 0 1 Write back, write alloc
* 1 0 Write through, no write alloc
* 1 1 Write back, no write alloc
*/
#define TEX_ARMV6_TEX 0x07 /* 3 bits in TEX */