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pc/piix_pci: factor out smram/pam logic

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Factor out smram/pam logic for use by other chipsets, namely q35
at this point.

Note: Should be factored out into a generic North Bridge Class.

[jbaron@redhat.com: changes for updated memory API]
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Isaku Yamahata 2012-11-14 15:54:02 -05:00 committed by Anthony Liguori
parent d8ee03843f
commit 410edd922d
4 changed files with 200 additions and 53 deletions
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1
hw/Makefile.objs
View file

@ -38,6 +38,7 @@ common-obj-$(CONFIG_SMARTCARD) += ccid-card-passthru.o
common-obj-$(CONFIG_SMARTCARD_NSS) += ccid-card-emulated.o
common-obj-$(CONFIG_I8259) += i8259_common.o i8259.o
common-obj-y += fifo.o
common-obj-y += pam.o
# PPC devices
common-obj-$(CONFIG_PREP_PCI) += prep_pci.o

87
hw/pam.c Normal file
View file

@ -0,0 +1,87 @@
/*
* QEMU i440FX/PIIX3 PCI Bridge Emulation
*
* Copyright (c) 2006 Fabrice Bellard
* Copyright (c) 2011 Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
* Copyright (c) 2012 Jason Baron <jbaron@redhat.com>
*
* Split out from piix_pci.c
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysemu.h"
#include "pam.h"
void smram_update(MemoryRegion *smram_region, uint8_t smram,
uint8_t smm_enabled)
{
bool smram_enabled;
smram_enabled = ((smm_enabled && (smram & SMRAM_G_SMRAME)) ||
(smram & SMRAM_D_OPEN));
memory_region_set_enabled(smram_region, !smram_enabled);
}
void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram,
MemoryRegion *smram_region)
{
uint8_t smm_enabled = (smm != 0);
if (*host_smm_enabled != smm_enabled) {
*host_smm_enabled = smm_enabled;
smram_update(smram_region, smram, *host_smm_enabled);
}
}
void init_pam(MemoryRegion *ram_memory, MemoryRegion *system_memory,
MemoryRegion *pci_address_space, PAMMemoryRegion *mem,
uint32_t start, uint32_t size)
{
int i;
/* RAM */
memory_region_init_alias(&mem->alias[3], "pam-ram", ram_memory,
start, size);
/* ROM (XXX: not quite correct) */
memory_region_init_alias(&mem->alias[1], "pam-rom", ram_memory,
start, size);
memory_region_set_readonly(&mem->alias[1], true);
/* XXX: should distinguish read/write cases */
memory_region_init_alias(&mem->alias[0], "pam-pci", pci_address_space,
start, size);
memory_region_init_alias(&mem->alias[2], "pam-pci", pci_address_space,
start, size);
for (i = 0; i < 4; ++i) {
memory_region_set_enabled(&mem->alias[i], false);
memory_region_add_subregion_overlap(system_memory, start,
&mem->alias[i], 1);
}
mem->current = 0;
}
void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val)
{
assert(0 <= idx && idx <= 12);
memory_region_set_enabled(&pam->alias[pam->current], false);
pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK;
memory_region_set_enabled(&pam->alias[pam->current], true);
}

97
hw/pam.h Normal file
View file

@ -0,0 +1,97 @@
#ifndef QEMU_PAM_H
#define QEMU_PAM_H
/*
* Copyright (c) 2006 Fabrice Bellard
* Copyright (c) 2011 Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
* Copyright (c) 2012 Jason Baron <jbaron@redhat.com>
*
* Split out from piix_pci.c
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* SMRAM memory area and PAM memory area in Legacy address range for PC.
* PAM: Programmable Attribute Map registers
*
* 0xa0000 - 0xbffff compatible SMRAM
*
* 0xc0000 - 0xc3fff Expansion area memory segments
* 0xc4000 - 0xc7fff
* 0xc8000 - 0xcbfff
* 0xcc000 - 0xcffff
* 0xd0000 - 0xd3fff
* 0xd4000 - 0xd7fff
* 0xd8000 - 0xdbfff
* 0xdc000 - 0xdffff
* 0xe0000 - 0xe3fff Extended System BIOS Area Memory Segments
* 0xe4000 - 0xe7fff
* 0xe8000 - 0xebfff
* 0xec000 - 0xeffff
*
* 0xf0000 - 0xfffff System BIOS Area Memory Segments
*/
#include "qemu-common.h"
#include "memory.h"
#define SMRAM_C_BASE 0xa0000
#define SMRAM_C_END 0xc0000
#define SMRAM_C_SIZE 0x20000
#define PAM_EXPAN_BASE 0xc0000
#define PAM_EXPAN_SIZE 0x04000
#define PAM_EXBIOS_BASE 0xe0000
#define PAM_EXBIOS_SIZE 0x04000
#define PAM_BIOS_BASE 0xf0000
#define PAM_BIOS_END 0xfffff
/* 64KB: Intel 3 series express chipset family p. 58*/
#define PAM_BIOS_SIZE 0x10000
/* PAM registers: log nibble and high nibble*/
#define PAM_ATTR_WE ((uint8_t)2)
#define PAM_ATTR_RE ((uint8_t)1)
#define PAM_ATTR_MASK ((uint8_t)3)
/* SMRAM register */
#define SMRAM_D_OPEN ((uint8_t)(1 << 6))
#define SMRAM_D_CLS ((uint8_t)(1 << 5))
#define SMRAM_D_LCK ((uint8_t)(1 << 4))
#define SMRAM_G_SMRAME ((uint8_t)(1 << 3))
#define SMRAM_C_BASE_SEG_MASK ((uint8_t)0x7)
#define SMRAM_C_BASE_SEG ((uint8_t)0x2) /* hardwired to b010 */
typedef struct PAMMemoryRegion {
MemoryRegion alias[4]; /* index = PAM value */
unsigned current;
} PAMMemoryRegion;
void smram_update(MemoryRegion *smram_region, uint8_t smram,
uint8_t smm_enabled);
void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram,
MemoryRegion *smram_region);
void init_pam(MemoryRegion *ram, MemoryRegion *system, MemoryRegion *pci,
PAMMemoryRegion *mem, uint32_t start, uint32_t size);
void pam_update(PAMMemoryRegion *mem, int idx, uint8_t val);
#endif /* QEMU_PAM_H */

68
hw/piix_pci.c
View file

@ -30,6 +30,7 @@
#include "sysbus.h"
#include "range.h"
#include "xen.h"
#include "pam.h"
/*
* I440FX chipset data sheet.
@ -68,11 +69,6 @@ typedef struct PIIX3State {
int32_t pci_irq_levels_vmstate[PIIX_NUM_PIRQS];
} PIIX3State;
typedef struct PAMMemoryRegion {
MemoryRegion alias[4]; /* index = PAM value */
unsigned current;
} PAMMemoryRegion;
struct PCII440FXState {
PCIDevice dev;
MemoryRegion *system_memory;
@ -105,52 +101,16 @@ static int pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx)
return (pci_intx + slot_addend) & 3;
}
static void init_pam(PCII440FXState *d, PAMMemoryRegion *mem,
uint32_t start, uint32_t size)
static void i440fx_update_memory_mappings(PCII440FXState *d)
{
int i;
/* RAM */
memory_region_init_alias(&mem->alias[3], "pam-ram", d->ram_memory, start, size);
/* ROM (XXX: not quite correct) */
memory_region_init_alias(&mem->alias[1], "pam-rom", d->ram_memory, start, size);
memory_region_set_readonly(&mem->alias[1], true);
/* XXX: should distinguish read/write cases */
memory_region_init_alias(&mem->alias[0], "pam-pci", d->pci_address_space,
start, size);
memory_region_init_alias(&mem->alias[2], "pam-pci", d->pci_address_space,
start, size);
for (i = 0; i < 4; ++i) {
memory_region_set_enabled(&mem->alias[i], false);
memory_region_add_subregion_overlap(d->system_memory, start, &mem->alias[i], 1);
}
mem->current = 0;
}
static void update_pam(PAMMemoryRegion *pam, unsigned r)
{
memory_region_set_enabled(&pam->alias[pam->current], false);
pam->current = r;
memory_region_set_enabled(&pam->alias[pam->current], true);
}
static void i440fx_update_memory_mappings(PCII440FXState *d)
{
int i, r;
uint32_t smram;
bool smram_enabled;
memory_region_transaction_begin();
update_pam(&d->pam_regions[0], (d->dev.config[I440FX_PAM] >> 4) & 3);
for(i = 0; i < 12; i++) {
r = (d->dev.config[(i >> 1) + (I440FX_PAM + 1)] >> ((i & 1) * 4)) & 3;
update_pam(&d->pam_regions[i+1], r);
for (i = 0; i < 13; i++) {
pam_update(&d->pam_regions[i], i,
d->dev.config[I440FX_PAM + ((i + 1) / 2)]);
}
smram = d->dev.config[I440FX_SMRAM];
smram_enabled = (d->smm_enabled && (smram & 0x08)) || (smram & 0x40);
memory_region_set_enabled(&d->smram_region, !smram_enabled);
smram_update(&d->smram_region, d->dev.config[I440FX_SMRAM], d->smm_enabled);
memory_region_transaction_commit();
}
@ -158,11 +118,10 @@ static void i440fx_set_smm(int val, void *arg)
{
PCII440FXState *d = arg;
val = (val != 0);
if (d->smm_enabled != val) {
d->smm_enabled = val;
i440fx_update_memory_mappings(d);
}
memory_region_transaction_begin();
smram_set_smm(&d->smm_enabled, val, d->dev.config[I440FX_SMRAM],
&d->smram_region);
memory_region_transaction_commit();
}
@ -300,9 +259,12 @@ static PCIBus *i440fx_common_init(const char *device_name,
memory_region_add_subregion_overlap(f->system_memory, 0xa0000,
&f->smram_region, 1);
memory_region_set_enabled(&f->smram_region, false);
init_pam(f, &f->pam_regions[0], 0xf0000, 0x10000);
init_pam(f->ram_memory, f->system_memory, f->pci_address_space,
&f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
for (i = 0; i < 12; ++i) {
init_pam(f, &f->pam_regions[i+1], 0xc0000 + i * 0x4000, 0x4000);
init_pam(f->ram_memory, f->system_memory, f->pci_address_space,
&f->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE,
PAM_EXPAN_SIZE);
}
/* Xen supports additional interrupt routes from the PCI devices to