source: bootcd/isolinux/syslinux-6.03/com32/gpllib/acpi/acpi.c

/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2009-2011 Erwan Velu - All Rights Reserved
 *
 *   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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include "acpi/acpi.h"

/* M1PS flags have to be interpreted as strings */
char *flags_to_string(char *buffer, uint16_t flags)
{
    strcpy(buffer, "default");
    if ((flags & POLARITY_ACTIVE_HIGH) == POLARITY_ACTIVE_HIGH)
        strcpy(buffer, "high");
    else if ((flags & POLARITY_ACTIVE_LOW) == POLARITY_ACTIVE_LOW)
        strcpy(buffer, "low");
    if ((flags & TRIGGER_EDGE) == TRIGGER_EDGE)
        strncat(buffer, " edge", 5);
    else if ((flags & TRIGGER_LEVEL) == TRIGGER_LEVEL)
        strncat(buffer, " level", 6);
    else
        strncat(buffer, " default", 8);

    return buffer;
}

void dbg_printf(const char *fmt, ...)
{
        va_list args;
        va_start(args, fmt);
        vfprintf(stderr, fmt, args);
        va_end(args);
}

void init_acpi(s_acpi * acpi)
{
    memset(acpi, 0, sizeof(s_acpi));
}

int parse_acpi(s_acpi * acpi)
{
    int ret_val;
    init_acpi(acpi);

    /* Let's seach for RSDP table */
    if ((ret_val = search_rsdp(acpi)) != RSDP_TABLE_FOUND)
        return ret_val;

    /* Let's seach for RSDT table
     * That's not a big deal not having it, XSDT is far more relevant */
    parse_rsdt(&acpi->rsdt);
    if (parse_xsdt(acpi) != XSDT_TABLE_FOUND) {
            DEBUG_PRINT(("XSDT Detection failed\n"));
            for (int table=0; table <acpi->rsdt.entry_count; table++) {
                parse_header((uint64_t *)acpi->rsdt.entry[table],acpi);
            }
    }
    return ACPI_FOUND;
}

void get_acpi_description_header(uint8_t * q, s_acpi_description_header * adh)
{
    cp_str_struct(adh->signature);
    cp_struct(&adh->length);
    cp_struct(&adh->revision);
    cp_struct(&adh->checksum);
    cp_str_struct(adh->oem_id);
    cp_str_struct(adh->oem_table_id);
    cp_struct(&adh->oem_revision);
    cp_str_struct(adh->creator_id);
    cp_struct(&adh->creator_revision);
    DEBUG_PRINT(("acpi_header at %p = %s | %s | %s\n", q, adh->signature,adh->oem_id, adh->creator_id ));
}

bool parse_header(uint64_t *address, s_acpi *acpi) {
            s_acpi_description_header adh;
            memset(&adh, 0, sizeof(adh));

            get_acpi_description_header((uint8_t *)address, &adh);

            /* Trying to determine the pointed table */
            /* Looking for FADT */
            if (memcmp(adh.signature, FACP, sizeof(FACP) - 1) == 0) {
                DEBUG_PRINT(("FACP table found\n"));
                s_fadt *f = &acpi->fadt;
                s_facs *fa = &acpi->facs;
                s_dsdt *d = &acpi->dsdt;
                /* This structure is valid, let's fill it */
                f->valid = true;
                f->address = address;
                memcpy(&f->header, &adh, sizeof(adh));
                parse_fadt(f);

                /* FACS wasn't already detected
                 * FADT points to it, let's try to detect it */
                if (fa->valid == false) {
                    fa->address = (uint64_t *)f->x_firmware_ctrl;
                    parse_facs(fa);
                    if (fa->valid == false) {
                        /* Let's try again */
                        fa->address = (uint64_t *)f->firmware_ctrl;
                        parse_facs(fa);
                    }
                }

                /* DSDT wasn't already detected
                 * FADT points to it, let's try to detect it */
                if (d->valid == false) {
                    s_acpi_description_header new_adh;
                    get_acpi_description_header((uint8_t *)f->x_dsdt,
                                                &new_adh);
                    if (memcmp(new_adh.signature, DSDT, sizeof(DSDT) - 1) == 0) {
                        DEBUG_PRINT(("DSDT table found via x_dsdt\n"));
                        d->valid = true;
                        d->address = (uint64_t *)f->x_dsdt;
                        memcpy(&d->header, &new_adh, sizeof(new_adh));
                        parse_dsdt(d);
                    } else {
                        /* Let's try again */
                        get_acpi_description_header((uint8_t *)f->dsdt_address,
                                                    &new_adh);
                        if (memcmp(new_adh.signature, DSDT, sizeof(DSDT) - 1) ==
                            0) {
                            DEBUG_PRINT(("DSDT table found via dsdt_address\n"));
                            d->valid = true;
                            d->address = (uint64_t *)f->dsdt_address;
                            memcpy(&d->header, &new_adh, sizeof(new_adh));
                            parse_dsdt(d);
                        }
                    }
                }
            } /* Looking for MADT */
            else if (memcmp(adh.signature, APIC, sizeof(APIC) - 1) == 0) {
                DEBUG_PRINT(("MADT table found\n"));
                s_madt *m = &acpi->madt;
                /* This structure is valid, let's fill it */
                m->valid = true;
                m->address =address;
                memcpy(&m->header, &adh, sizeof(adh));
                parse_madt(acpi);
            } else if (memcmp(adh.signature, DSDT, sizeof(DSDT) - 1) == 0) {
                DEBUG_PRINT(("DSDT table found\n"));
                s_dsdt *d = &acpi->dsdt;
                /* This structure is valid, let's fill it */
                d->valid = true;
                d->address = address;
                memcpy(&d->header, &adh, sizeof(adh));
                parse_dsdt(d);
                /* PSDT have to be considered as SSDT. Intel ACPI Spec @ 5.2.11.3 */
            } else if ((memcmp(adh.signature, SSDT, sizeof(SSDT) - 1) == 0)
                       || (memcmp(adh.signature, PSDT, sizeof(PSDT) - 1) == 0)) {
                
                DEBUG_PRINT(("SSDT table found with %s \n",adh.signature));

                if ((acpi->ssdt_count >= MAX_SSDT - 1))
                    return false;

                /* We can have many SSDT, so let's allocate a new one */
                if ((acpi->ssdt[acpi->ssdt_count] =
                     malloc(sizeof(s_ssdt))) == NULL)
                    return false;
                s_ssdt *s = acpi->ssdt[acpi->ssdt_count];

                /* This structure is valid, let's fill it */
                s->valid = true;
                s->address = address;
                memcpy(&s->header, &adh, sizeof(adh));

                /* Searching how much definition blocks we must copy */
                uint32_t definition_block_size = adh.length - ACPI_HEADER_SIZE;
                if ((s->definition_block =
                     malloc(definition_block_size)) != NULL) {
                    memcpy(s->definition_block,
                           (s->address + ACPI_HEADER_SIZE),
                           definition_block_size);
                }
                /* Increment the number of ssdt we have */
                acpi->ssdt_count++;
            } else if (memcmp(adh.signature, SBST, sizeof(SBST) - 1) == 0) {
                DEBUG_PRINT(("SBST table found\n"));
                s_sbst *s = &acpi->sbst;
                /* This structure is valid, let's fill it */
                s->valid = true;
                s->address = address;
                memcpy(&s->header, &adh, sizeof(adh));
                parse_sbst(s);
            } else if (memcmp(adh.signature, ECDT, sizeof(ECDT) - 1) == 0) {
                DEBUG_PRINT(("ECDT table found\n"));
                s_ecdt *e = &acpi->ecdt;
                /* This structure is valid, let's fill it */
                e->valid = true;
                e->address = address;
                memcpy(&e->header, &adh, sizeof(adh));
                parse_ecdt(e);
            }  else if (memcmp(adh.signature, HPET, sizeof(HPET) - 1) == 0) {
                DEBUG_PRINT(("HPET table found\n"));
                s_hpet *h = &acpi->hpet;
                /* This structure is valid, let's fill it */
                h->valid = true;
                h->address = address;
                memcpy(&h->header, &adh, sizeof(adh));
            } else if (memcmp(adh.signature, TCPA, sizeof(TCPA) - 1) == 0) {
                DEBUG_PRINT(("TCPA table found\n"));
                s_tcpa *t = &acpi->tcpa;
                /* This structure is valid, let's fill it */
                t->valid = true;
                t->address = address;
                memcpy(&t->header, &adh, sizeof(adh));
            } else if (memcmp(adh.signature, MCFG, sizeof(MCFG) - 1) == 0) {
                DEBUG_PRINT(("MCFG table found\n"));
                s_mcfg *m = &acpi->mcfg;
                /* This structure is valid, let's fill it */
                m->valid = true;
                m->address = address;
                memcpy(&m->header, &adh, sizeof(adh));
            } else if (memcmp(adh.signature, SLIC, sizeof(SLIC) - 1) == 0) {
                DEBUG_PRINT(("SLIC table found\n"));
                s_slic *s = &acpi->slic;
                /* This structure is valid, let's fill it */
                s->valid = true;
                s->address = address;
                memcpy(&s->header, &adh, sizeof(adh));
            } else if (memcmp(adh.signature, BOOT, sizeof(BOOT) - 1) == 0) {
                DEBUG_PRINT(("BOOT table found\n"));
                s_boot *b = &acpi->boot;
                /* This structure is valid, let's fill it */
                b->valid = true;
                b->address = address;
                memcpy(&b->header, &adh, sizeof(adh));
            }
            
            return true;
}