hw/acpi.c - chromiumos/third_party/qemu - Git at Google

 /*
  * ACPI implementation
  *
  * Copyright (c) 2006 Fabrice Bellard
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License version 2 as published by the Free Software Foundation.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  */
 #include "sysemu.h"
 #include "hw.h"
 #include "pc.h"
 #include "acpi.h"

 struct acpi_table_header
 {
     char signature [4];    /* ACPI signature (4 ASCII characters) */
     uint32_t length;          /* Length of table, in bytes, including header */
     uint8_t revision;         /* ACPI Specification minor version # */
     uint8_t checksum;         /* To make sum of entire table == 0 */
     char oem_id [6];       /* OEM identification */
     char oem_table_id [8]; /* OEM table identification */
     uint32_t oem_revision;    /* OEM revision number */
     char asl_compiler_id [4]; /* ASL compiler vendor ID */
     uint32_t asl_compiler_revision; /* ASL compiler revision number */
 } __attribute__((packed));

 char *acpi_tables;
 size_t acpi_tables_len;

 static int acpi_checksum(const uint8_t *data, int len)
 {
     int sum, i;
     sum = 0;
     for(i = 0; i < len; i++)
         sum += data[i];
     return (-sum) & 0xff;
 }

 int acpi_table_add(const char *t)
 {
     static const char *dfl_id = "QEMUQEMU";
     char buf[1024], *p, *f;
     struct acpi_table_header acpi_hdr;
     unsigned long val;
     uint32_t length;
     struct acpi_table_header *acpi_hdr_p;
     size_t off;

     memset(&acpi_hdr, 0, sizeof(acpi_hdr));

     if (get_param_value(buf, sizeof(buf), "sig", t)) {
         strncpy(acpi_hdr.signature, buf, 4);
     } else {
         strncpy(acpi_hdr.signature, dfl_id, 4);
     }
     if (get_param_value(buf, sizeof(buf), "rev", t)) {
         val = strtoul(buf, &p, 10);
         if (val > 255 || *p != '\0')
             goto out;
     } else {
         val = 1;
     }
     acpi_hdr.revision = (int8_t)val;

     if (get_param_value(buf, sizeof(buf), "oem_id", t)) {
         strncpy(acpi_hdr.oem_id, buf, 6);
     } else {
         strncpy(acpi_hdr.oem_id, dfl_id, 6);
     }

     if (get_param_value(buf, sizeof(buf), "oem_table_id", t)) {
         strncpy(acpi_hdr.oem_table_id, buf, 8);
     } else {
         strncpy(acpi_hdr.oem_table_id, dfl_id, 8);
     }

     if (get_param_value(buf, sizeof(buf), "oem_rev", t)) {
         val = strtol(buf, &p, 10);
         if(*p != '\0')
             goto out;
     } else {
         val = 1;
     }
     acpi_hdr.oem_revision = cpu_to_le32(val);

     if (get_param_value(buf, sizeof(buf), "asl_compiler_id", t)) {
         strncpy(acpi_hdr.asl_compiler_id, buf, 4);
     } else {
         strncpy(acpi_hdr.asl_compiler_id, dfl_id, 4);
     }

     if (get_param_value(buf, sizeof(buf), "asl_compiler_rev", t)) {
         val = strtol(buf, &p, 10);
         if(*p != '\0')
             goto out;
     } else {
         val = 1;
     }
     acpi_hdr.asl_compiler_revision = cpu_to_le32(val);

     if (!get_param_value(buf, sizeof(buf), "data", t)) {
          buf[0] = '\0';
     }

     length = sizeof(acpi_hdr);

     f = buf;
     while (buf[0]) {
         struct stat s;
         char *n = strchr(f, ':');
         if (n)
             *n = '\0';
         if(stat(f, &s) < 0) {
             fprintf(stderr, "Can't stat file '%s': %s\n", f, strerror(errno));
             goto out;
         }
         length += s.st_size;
         if (!n)
             break;
         *n = ':';
         f = n + 1;
     }

     if (!acpi_tables) {
         acpi_tables_len = sizeof(uint16_t);
         acpi_tables = qemu_mallocz(acpi_tables_len);
     }
     acpi_tables = qemu_realloc(acpi_tables,
                                acpi_tables_len + sizeof(uint16_t) + length);
     p = acpi_tables + acpi_tables_len;
     acpi_tables_len += sizeof(uint16_t) + length;

     *(uint16_t*)p = cpu_to_le32(length);
     p += sizeof(uint16_t);
     memcpy(p, &acpi_hdr, sizeof(acpi_hdr));
     off = sizeof(acpi_hdr);

     f = buf;
     while (buf[0]) {
         struct stat s;
         int fd;
         char *n = strchr(f, ':');
         if (n)
             *n = '\0';
         fd = open(f, O_RDONLY);

         if(fd < 0)
             goto out;
         if(fstat(fd, &s) < 0) {
             close(fd);
             goto out;
         }

         /* off < length is necessary because file size can be changed
            under our foot */
         while(s.st_size && off < length) {
             int r;
             r = read(fd, p + off, s.st_size);
             if (r > 0) {
                 off += r;
                 s.st_size -= r;
             } else if ((r < 0 && errno != EINTR) || r == 0) {
                 close(fd);
                 goto out;
             }
         }

         close(fd);
         if (!n)
             break;
         f = n + 1;
     }
     if (off < length) {
         /* don't pass random value in process to guest */
         memset(p + off, 0, length - off);
     }

     acpi_hdr_p = (struct acpi_table_header*)p;
     acpi_hdr_p->length = cpu_to_le32(length);
     acpi_hdr_p->checksum = acpi_checksum((uint8_t*)p, length);
     /* increase number of tables */
     (*(uint16_t*)acpi_tables) =
 	    cpu_to_le32(le32_to_cpu(*(uint16_t*)acpi_tables) + 1);
     return 0;
 out:
     if (acpi_tables) {
         qemu_free(acpi_tables);
         acpi_tables = NULL;
     }
     return -1;
 }

 /* ACPI PM1a EVT */
 uint16_t acpi_pm1_evt_get_sts(ACPIPM1EVT *pm1, int64_t overflow_time)
 {
     int64_t d = acpi_pm_tmr_get_clock();
     if (d >= overflow_time) {
         pm1->sts |= ACPI_BITMASK_TIMER_STATUS;
     }
     return pm1->sts;
 }

 void acpi_pm1_evt_write_sts(ACPIPM1EVT *pm1, ACPIPMTimer *tmr, uint16_t val)
 {
     uint16_t pm1_sts = acpi_pm1_evt_get_sts(pm1, tmr->overflow_time);
     if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {
         /* if TMRSTS is reset, then compute the new overflow time */
         acpi_pm_tmr_calc_overflow_time(tmr);
     }
     pm1->sts &= ~val;
 }

 void acpi_pm1_evt_power_down(ACPIPM1EVT *pm1, ACPIPMTimer *tmr)
 {
     if (!pm1) {
         qemu_system_shutdown_request();
     } else if (pm1->en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {
         pm1->sts |= ACPI_BITMASK_POWER_BUTTON_STATUS;
         tmr->update_sci(tmr);
     }
 }

 void acpi_pm1_evt_reset(ACPIPM1EVT *pm1)
 {
     pm1->sts = 0;
     pm1->en = 0;
 }

 /* ACPI PM_TMR */
 void acpi_pm_tmr_update(ACPIPMTimer *tmr, bool enable)
 {
     int64_t expire_time;

     /* schedule a timer interruption if needed */
     if (enable) {
         expire_time = muldiv64(tmr->overflow_time, get_ticks_per_sec(),
                                PM_TIMER_FREQUENCY);
         qemu_mod_timer(tmr->timer, expire_time);
     } else {
         qemu_del_timer(tmr->timer);
     }
 }

 void acpi_pm_tmr_calc_overflow_time(ACPIPMTimer *tmr)
 {
     int64_t d = acpi_pm_tmr_get_clock();
     tmr->overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
 }

 uint32_t acpi_pm_tmr_get(ACPIPMTimer *tmr)
 {
     uint32_t d = acpi_pm_tmr_get_clock();;
     return d & 0xffffff;
 }

 static void acpi_pm_tmr_timer(void *opaque)
 {
     ACPIPMTimer *tmr = opaque;
     tmr->update_sci(tmr);
 }

 void acpi_pm_tmr_init(ACPIPMTimer *tmr, acpi_update_sci_fn update_sci)
 {
     tmr->update_sci = update_sci;
     tmr->timer = qemu_new_timer_ns(vm_clock, acpi_pm_tmr_timer, tmr);
 }

 void acpi_pm_tmr_reset(ACPIPMTimer *tmr)
 {
     tmr->overflow_time = 0;
     qemu_del_timer(tmr->timer);
 }

 /* ACPI PM1aCNT */
 void acpi_pm1_cnt_init(ACPIPM1CNT *pm1_cnt, qemu_irq cmos_s3)
 {
     pm1_cnt->cmos_s3 = cmos_s3;
 }

 void acpi_pm1_cnt_write(ACPIPM1EVT *pm1a, ACPIPM1CNT *pm1_cnt, uint16_t val)
 {
     pm1_cnt->cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);

     if (val & ACPI_BITMASK_SLEEP_ENABLE) {
         /* change suspend type */
         uint16_t sus_typ = (val >> 10) & 7;
         switch(sus_typ) {
         case 0: /* soft power off */
             qemu_system_shutdown_request();
             break;
         case 1:
             /* ACPI_BITMASK_WAKE_STATUS should be set on resume.
                Pretend that resume was caused by power button */
             pm1a->sts |=
                 (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_POWER_BUTTON_STATUS);
             qemu_system_reset_request();
             qemu_irq_raise(pm1_cnt->cmos_s3);
         default:
             break;
         }
     }
 }

 void acpi_pm1_cnt_update(ACPIPM1CNT *pm1_cnt,
                          bool sci_enable, bool sci_disable)
 {
     /* ACPI specs 3.0, 4.7.2.5 */
     if (sci_enable) {
         pm1_cnt->cnt |= ACPI_BITMASK_SCI_ENABLE;
     } else if (sci_disable) {
         pm1_cnt->cnt &= ~ACPI_BITMASK_SCI_ENABLE;
     }
 }

 void acpi_pm1_cnt_reset(ACPIPM1CNT *pm1_cnt)
 {
     pm1_cnt->cnt = 0;
     if (pm1_cnt->cmos_s3) {
         qemu_irq_lower(pm1_cnt->cmos_s3);
     }
 }

 /* ACPI GPE */
 void acpi_gpe_init(ACPIGPE *gpe, uint8_t len)
 {
     gpe->len = len;
     gpe->sts = qemu_mallocz(len / 2);
     gpe->en = qemu_mallocz(len / 2);
 }

 void acpi_gpe_blk(ACPIGPE *gpe, uint32_t blk)
 {
     gpe->blk = blk;
 }

 void acpi_gpe_reset(ACPIGPE *gpe)
 {
     memset(gpe->sts, 0, gpe->len / 2);
     memset(gpe->en, 0, gpe->len / 2);
 }

 static uint8_t *acpi_gpe_ioport_get_ptr(ACPIGPE *gpe, uint32_t addr)
 {
     uint8_t *cur = NULL;

     if (addr < gpe->len / 2) {
         cur = gpe->sts + addr;
     } else if (addr < gpe->len) {
         cur = gpe->en + addr - gpe->len / 2;
     } else {
         abort();
     }

     return cur;
 }

 void acpi_gpe_ioport_writeb(ACPIGPE *gpe, uint32_t addr, uint32_t val)
 {
     uint8_t *cur;

     addr -= gpe->blk;
     cur = acpi_gpe_ioport_get_ptr(gpe, addr);
     if (addr < gpe->len / 2) {
         /* GPE_STS */
         *cur = (*cur) & ~val;
     } else if (addr < gpe->len) {
         /* GPE_EN */
         *cur = val;
     } else {
         abort();
     }
 }

 uint32_t acpi_gpe_ioport_readb(ACPIGPE *gpe, uint32_t addr)
 {
     uint8_t *cur;
     uint32_t val;

     addr -= gpe->blk;
     cur = acpi_gpe_ioport_get_ptr(gpe, addr);
     val = 0;
     if (cur != NULL) {
         val = *cur;
     }

     return val;
 }
	/*
	* ACPI implementation
	*
	* Copyright (c) 2006 Fabrice Bellard
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License version 2 as published by the Free Software Foundation.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>
	*/
	#include "sysemu.h"
	#include "hw.h"
	#include "pc.h"
	#include "acpi.h"

	struct acpi_table_header
	{
	char signature [4]; /* ACPI signature (4 ASCII characters) */
	uint32_t length; /* Length of table, in bytes, including header */
	uint8_t revision; /* ACPI Specification minor version # */
	uint8_t checksum; /* To make sum of entire table == 0 */
	char oem_id [6]; /* OEM identification */
	char oem_table_id [8]; /* OEM table identification */
	uint32_t oem_revision; /* OEM revision number */
	char asl_compiler_id [4]; /* ASL compiler vendor ID */
	uint32_t asl_compiler_revision; /* ASL compiler revision number */
	} __attribute__((packed));

	char *acpi_tables;
	size_t acpi_tables_len;

	static int acpi_checksum(const uint8_t *data, int len)
	{
	int sum, i;
	sum = 0;
	for(i = 0; i < len; i++)
	sum += data[i];
	return (-sum) & 0xff;
	}

	int acpi_table_add(const char *t)
	{
	static const char *dfl_id = "QEMUQEMU";
	char buf[1024], p, f;
	struct acpi_table_header acpi_hdr;
	unsigned long val;
	uint32_t length;
	struct acpi_table_header *acpi_hdr_p;
	size_t off;

	memset(&acpi_hdr, 0, sizeof(acpi_hdr));

	if (get_param_value(buf, sizeof(buf), "sig", t)) {
	strncpy(acpi_hdr.signature, buf, 4);
	} else {
	strncpy(acpi_hdr.signature, dfl_id, 4);
	}
	if (get_param_value(buf, sizeof(buf), "rev", t)) {
	val = strtoul(buf, &p, 10);
	if (val > 255 \|\| *p != '\0')
	goto out;
	} else {
	val = 1;
	}
	acpi_hdr.revision = (int8_t)val;

	if (get_param_value(buf, sizeof(buf), "oem_id", t)) {
	strncpy(acpi_hdr.oem_id, buf, 6);
	} else {
	strncpy(acpi_hdr.oem_id, dfl_id, 6);
	}

	if (get_param_value(buf, sizeof(buf), "oem_table_id", t)) {
	strncpy(acpi_hdr.oem_table_id, buf, 8);
	} else {
	strncpy(acpi_hdr.oem_table_id, dfl_id, 8);
	}

	if (get_param_value(buf, sizeof(buf), "oem_rev", t)) {
	val = strtol(buf, &p, 10);
	if(*p != '\0')
	goto out;
	} else {
	val = 1;
	}
	acpi_hdr.oem_revision = cpu_to_le32(val);

	if (get_param_value(buf, sizeof(buf), "asl_compiler_id", t)) {
	strncpy(acpi_hdr.asl_compiler_id, buf, 4);
	} else {
	strncpy(acpi_hdr.asl_compiler_id, dfl_id, 4);
	}

	if (get_param_value(buf, sizeof(buf), "asl_compiler_rev", t)) {
	val = strtol(buf, &p, 10);
	if(*p != '\0')
	goto out;
	} else {
	val = 1;
	}
	acpi_hdr.asl_compiler_revision = cpu_to_le32(val);

	if (!get_param_value(buf, sizeof(buf), "data", t)) {
	buf[0] = '\0';
	}

	length = sizeof(acpi_hdr);

	f = buf;
	while (buf[0]) {
	struct stat s;
	char *n = strchr(f, ':');
	if (n)
	*n = '\0';
	if(stat(f, &s) < 0) {
	fprintf(stderr, "Can't stat file '%s': %s\n", f, strerror(errno));
	goto out;
	}
	length += s.st_size;
	if (!n)
	break;
	*n = ':';
	f = n + 1;
	}

	if (!acpi_tables) {
	acpi_tables_len = sizeof(uint16_t);
	acpi_tables = qemu_mallocz(acpi_tables_len);
	}
	acpi_tables = qemu_realloc(acpi_tables,
	acpi_tables_len + sizeof(uint16_t) + length);
	p = acpi_tables + acpi_tables_len;
	acpi_tables_len += sizeof(uint16_t) + length;

	(uint16_t)p = cpu_to_le32(length);
	p += sizeof(uint16_t);
	memcpy(p, &acpi_hdr, sizeof(acpi_hdr));
	off = sizeof(acpi_hdr);

	f = buf;
	while (buf[0]) {
	struct stat s;
	int fd;
	char *n = strchr(f, ':');
	if (n)
	*n = '\0';
	fd = open(f, O_RDONLY);

	if(fd < 0)
	goto out;
	if(fstat(fd, &s) < 0) {
	close(fd);
	goto out;
	}

	/* off < length is necessary because file size can be changed
	under our foot */
	while(s.st_size && off < length) {
	int r;
	r = read(fd, p + off, s.st_size);
	if (r > 0) {
	off += r;
	s.st_size -= r;
	} else if ((r < 0 && errno != EINTR) \|\| r == 0) {
	close(fd);
	goto out;
	}
	}

	close(fd);
	if (!n)
	break;
	f = n + 1;
	}
	if (off < length) {
	/* don't pass random value in process to guest */
	memset(p + off, 0, length - off);
	}

	acpi_hdr_p = (struct acpi_table_header*)p;
	acpi_hdr_p->length = cpu_to_le32(length);
	acpi_hdr_p->checksum = acpi_checksum((uint8_t*)p, length);
	/* increase number of tables */
	((uint16_t)acpi_tables) =
	cpu_to_le32(le32_to_cpu((uint16_t)acpi_tables) + 1);
	return 0;
	out:
	if (acpi_tables) {
	qemu_free(acpi_tables);
	acpi_tables = NULL;
	}
	return -1;
	}

	/* ACPI PM1a EVT */
	uint16_t acpi_pm1_evt_get_sts(ACPIPM1EVT *pm1, int64_t overflow_time)
	{
	int64_t d = acpi_pm_tmr_get_clock();
	if (d >= overflow_time) {
	pm1->sts \|= ACPI_BITMASK_TIMER_STATUS;
	}
	return pm1->sts;
	}

	void acpi_pm1_evt_write_sts(ACPIPM1EVT pm1, ACPIPMTimer tmr, uint16_t val)
	{
	uint16_t pm1_sts = acpi_pm1_evt_get_sts(pm1, tmr->overflow_time);
	if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {
	/* if TMRSTS is reset, then compute the new overflow time */
	acpi_pm_tmr_calc_overflow_time(tmr);
	}
	pm1->sts &= ~val;
	}

	void acpi_pm1_evt_power_down(ACPIPM1EVT pm1, ACPIPMTimer tmr)
	{
	if (!pm1) {
	qemu_system_shutdown_request();
	} else if (pm1->en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {
	pm1->sts \|= ACPI_BITMASK_POWER_BUTTON_STATUS;
	tmr->update_sci(tmr);
	}
	}

	void acpi_pm1_evt_reset(ACPIPM1EVT *pm1)
	{
	pm1->sts = 0;
	pm1->en = 0;
	}

	/* ACPI PM_TMR */
	void acpi_pm_tmr_update(ACPIPMTimer *tmr, bool enable)
	{
	int64_t expire_time;

	/* schedule a timer interruption if needed */
	if (enable) {
	expire_time = muldiv64(tmr->overflow_time, get_ticks_per_sec(),
	PM_TIMER_FREQUENCY);
	qemu_mod_timer(tmr->timer, expire_time);
	} else {
	qemu_del_timer(tmr->timer);
	}
	}

	void acpi_pm_tmr_calc_overflow_time(ACPIPMTimer *tmr)
	{
	int64_t d = acpi_pm_tmr_get_clock();
	tmr->overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
	}

	uint32_t acpi_pm_tmr_get(ACPIPMTimer *tmr)
	{
	uint32_t d = acpi_pm_tmr_get_clock();;
	return d & 0xffffff;
	}

	static void acpi_pm_tmr_timer(void *opaque)
	{
	ACPIPMTimer *tmr = opaque;
	tmr->update_sci(tmr);
	}

	void acpi_pm_tmr_init(ACPIPMTimer *tmr, acpi_update_sci_fn update_sci)
	{
	tmr->update_sci = update_sci;
	tmr->timer = qemu_new_timer_ns(vm_clock, acpi_pm_tmr_timer, tmr);
	}

	void acpi_pm_tmr_reset(ACPIPMTimer *tmr)
	{
	tmr->overflow_time = 0;
	qemu_del_timer(tmr->timer);
	}

	/* ACPI PM1aCNT */
	void acpi_pm1_cnt_init(ACPIPM1CNT *pm1_cnt, qemu_irq cmos_s3)
	{
	pm1_cnt->cmos_s3 = cmos_s3;
	}

	void acpi_pm1_cnt_write(ACPIPM1EVT pm1a, ACPIPM1CNT pm1_cnt, uint16_t val)
	{
	pm1_cnt->cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);

	if (val & ACPI_BITMASK_SLEEP_ENABLE) {
	/* change suspend type */
	uint16_t sus_typ = (val >> 10) & 7;
	switch(sus_typ) {
	case 0: /* soft power off */
	qemu_system_shutdown_request();
	break;
	case 1:
	/* ACPI_BITMASK_WAKE_STATUS should be set on resume.
	Pretend that resume was caused by power button */
	pm1a->sts \|=
	(ACPI_BITMASK_WAKE_STATUS \| ACPI_BITMASK_POWER_BUTTON_STATUS);
	qemu_system_reset_request();
	qemu_irq_raise(pm1_cnt->cmos_s3);
	default:
	break;
	}
	}
	}

	void acpi_pm1_cnt_update(ACPIPM1CNT *pm1_cnt,
	bool sci_enable, bool sci_disable)
	{
	/* ACPI specs 3.0, 4.7.2.5 */
	if (sci_enable) {
	pm1_cnt->cnt \|= ACPI_BITMASK_SCI_ENABLE;
	} else if (sci_disable) {
	pm1_cnt->cnt &= ~ACPI_BITMASK_SCI_ENABLE;
	}
	}

	void acpi_pm1_cnt_reset(ACPIPM1CNT *pm1_cnt)
	{
	pm1_cnt->cnt = 0;
	if (pm1_cnt->cmos_s3) {
	qemu_irq_lower(pm1_cnt->cmos_s3);
	}
	}

	/* ACPI GPE */
	void acpi_gpe_init(ACPIGPE *gpe, uint8_t len)
	{
	gpe->len = len;
	gpe->sts = qemu_mallocz(len / 2);
	gpe->en = qemu_mallocz(len / 2);
	}

	void acpi_gpe_blk(ACPIGPE *gpe, uint32_t blk)
	{
	gpe->blk = blk;
	}

	void acpi_gpe_reset(ACPIGPE *gpe)
	{
	memset(gpe->sts, 0, gpe->len / 2);
	memset(gpe->en, 0, gpe->len / 2);
	}

	static uint8_t acpi_gpe_ioport_get_ptr(ACPIGPE gpe, uint32_t addr)
	{
	uint8_t *cur = NULL;

	if (addr < gpe->len / 2) {
	cur = gpe->sts + addr;
	} else if (addr < gpe->len) {
	cur = gpe->en + addr - gpe->len / 2;
	} else {
	abort();
	}

	return cur;
	}

	void acpi_gpe_ioport_writeb(ACPIGPE *gpe, uint32_t addr, uint32_t val)
	{
	uint8_t *cur;

	addr -= gpe->blk;
	cur = acpi_gpe_ioport_get_ptr(gpe, addr);
	if (addr < gpe->len / 2) {
	/* GPE_STS */
	cur = (cur) & ~val;
	} else if (addr < gpe->len) {
	/* GPE_EN */
	*cur = val;
	} else {
	abort();
	}
	}

	uint32_t acpi_gpe_ioport_readb(ACPIGPE *gpe, uint32_t addr)
	{
	uint8_t *cur;
	uint32_t val;

	addr -= gpe->blk;
	cur = acpi_gpe_ioport_get_ptr(gpe, addr);
	val = 0;
	if (cur != NULL) {
	val = *cur;
	}

	return val;
	}