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Document the need for pcb32_r8 to be quad-aligned, now that cpuswitch() 

uses Xscale's "strd" instruction.
This commit is contained in:
scw 2003-10-13 21:46:39 +00:00
parent 63d24b09fd
commit 9be5d4cbe9
1 changed files with 10 additions and 1 deletions
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11
sys/arch/arm/include/pcb.h
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@ -1,4 +1,4 @@
/* $NetBSD: pcb.h,v 1.9 2003/05/21 18:04:43 thorpej Exp $ */ /* $NetBSD: pcb.h,v 1.10 2003/10/13 21:46:39 scw Exp $ */
/* /*
* Copyright (c) 2001 Matt Thomas <matt@3am-software.com>. * Copyright (c) 2001 Matt Thomas <matt@3am-software.com>.
@ -49,6 +49,11 @@ struct pcb_arm32 {
pd_entry_t pcb32_l1vec; /* Value to stuff on ctx sw */ pd_entry_t pcb32_l1vec; /* Value to stuff on ctx sw */
u_int pcb32_dacr; /* Domain Access Control Reg */ u_int pcb32_dacr; /* Domain Access Control Reg */
void *pcb32_cstate; /* &pmap->pm_cstate */ void *pcb32_cstate; /* &pmap->pm_cstate */
/*
* WARNING!
* cpuswitch.S relies on pcb32_r8 being quad-aligned in struct pcb
* (due to the use of "strd" when compiled for XSCALE)
*/
u_int pcb32_r8; /* used */ u_int pcb32_r8; /* used */
u_int pcb32_r9; /* used */ u_int pcb32_r9; /* used */
u_int pcb32_r10; /* used */ u_int pcb32_r10; /* used */
@ -70,6 +75,10 @@ struct pcb_arm26 {
}; };
#define pcb_sf pcb_un.un_26.pcb26_sf #define pcb_sf pcb_un.un_26.pcb26_sf
/*
* WARNING!
* See warning for struct pcb_arm32, above, before changing struct pcb!
*/
struct pcb { struct pcb {
u_int pcb_flags; u_int pcb_flags;
#define PCB_OWNFPU 0x00000001 #define PCB_OWNFPU 0x00000001