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* Ask for a page-aligned page instead of an arbitrary address. This should

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not be necessary but might be helpful and at least reduce fragmentation.
* Add an assert to detect if the wakecode ever grows too big.  We include
  1 KB for stack, which should be more than enough also.
* Remove unnecessary initialization of static variables.
* Add comments and a bootverbose print giving the page phys address.
This commit is contained in:
Nate Lawson 2006-06-10 08:20:17 +00:00
parent 716d09af5e
commit dd311cb41a
1 changed files with 31 additions and 16 deletions
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47
sys/i386/acpica/acpi_wakeup.c
View file

@ -52,6 +52,9 @@ __FBSDID("$FreeBSD$");
#include "acpi_wakecode.h"
/* Make sure the code is less than one page and leave room for the stack. */
CTASSERT(sizeof(wakecode) < PAGE_SIZE - 1024);
#ifndef _SYS_CDEFS_H_
#error this file needs sys/cdefs.h as a prerequisite
#endif
@ -67,7 +70,7 @@ static uint32_t r_eax, r_ebx, r_ecx, r_edx, r_ebp, r_esi, r_edi,
r_efl, r_cr0, r_cr2, r_cr3, r_cr4, ret_addr;
static uint16_t r_cs, r_ds, r_es, r_fs, r_gs, r_ss, r_tr;
static uint32_t r_esp = 0;
static uint32_t r_esp;
static void acpi_printcpu(void);
static void acpi_realmodeinst(void *arg, bus_dma_segment_t *segs,
@ -282,7 +285,7 @@ out:
static bus_dma_tag_t acpi_waketag;
static bus_dmamap_t acpi_wakemap;
static vm_offset_t acpi_wakeaddr = 0;
static vm_offset_t acpi_wakeaddr;
static void
acpi_alloc_wakeup_handler(void)
@ -292,16 +295,21 @@ acpi_alloc_wakeup_handler(void)
if (!cold)
return;
if (bus_dma_tag_create(/* parent */ NULL, /* alignment */ 2, 0,
/* lowaddr below 1MB */ 0x9ffff,
/* highaddr */ BUS_SPACE_MAXADDR, NULL, NULL,
PAGE_SIZE, 1, PAGE_SIZE, 0, busdma_lock_mutex,
&Giant, &acpi_waketag) != 0) {
/*
* Specify the region for our wakeup code. We want it in the low 1 MB
* region, excluding video memory and above (0xa0000). We ask for
* it to be page-aligned, just to be safe.
*/
if (bus_dma_tag_create(/*parent*/ NULL,
/*alignment*/ PAGE_SIZE, /*no boundary*/ 0,
/*lowaddr*/ 0x9ffff, /*highaddr*/ BUS_SPACE_MAXADDR, NULL, NULL,
/*maxsize*/ PAGE_SIZE, /*segments*/ 1, /*maxsegsize*/ PAGE_SIZE,
0, busdma_lock_mutex, &Giant, &acpi_waketag) != 0) {
printf("acpi_alloc_wakeup_handler: can't create wake tag\n");
return;
}
if (bus_dmamem_alloc(acpi_waketag, &wakeaddr,
BUS_DMA_NOWAIT, &acpi_wakemap)) {
if (bus_dmamem_alloc(acpi_waketag, &wakeaddr, BUS_DMA_NOWAIT,
&acpi_wakemap) != 0) {
printf("acpi_alloc_wakeup_handler: can't alloc wake memory\n");
return;
}
@ -313,13 +321,21 @@ SYSINIT(acpiwakeup, SI_SUB_KMEM, SI_ORDER_ANY, acpi_alloc_wakeup_handler, 0)
static void
acpi_realmodeinst(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
struct acpi_softc *sc = arg;
uint32_t *addr;
struct acpi_softc *sc;
uint32_t *addr;
addr = (uint32_t *)&wakecode[wakeup_sw32 + 2];
*addr = segs[0].ds_addr + wakeup_32;
bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
/* Overwrite the ljmp target with the real address */
sc = arg;
sc->acpi_wakephys = segs[0].ds_addr;
addr = (uint32_t *)&wakecode[wakeup_sw32 + 2];
*addr = sc->acpi_wakephys + wakeup_32;
/* Copy the wake code into our low page and save its physical addr. */
bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
if (bootverbose) {
device_printf(sc->acpi_dev, "wakeup code va %#x pa %#x\n",
acpi_wakeaddr, sc->acpi_wakephys);
}
}
void
@ -333,6 +349,5 @@ acpi_install_wakeup_handler(struct acpi_softc *sc)
sc->acpi_wakemap = acpi_wakemap;
bus_dmamap_load(sc->acpi_waketag, sc->acpi_wakemap,
(void *)sc->acpi_wakeaddr, PAGE_SIZE,
acpi_realmodeinst, sc, 0);
(void *)sc->acpi_wakeaddr, PAGE_SIZE, acpi_realmodeinst, sc, 0);
}