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/*
* lib.c - Architecture-Specific Low-Level ACPI Support
*
* Copyright (C) 2015, Shannon Zhao <shannon.zhao@linaro.org>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; If not, see <http://www.gnu.org/licenses/>.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <xen/acpi.h>
#include <xen/init.h>
#include <xen/mm.h>
#include <asm/fixmap.h>
static bool fixmap_inuse;
char *__acpi_map_table(paddr_t phys, unsigned long size)
{
unsigned long base, offset;
mfn_t mfn;
unsigned int idx;
/* No arch specific implementation after early boot */
if ( system_state >= SYS_STATE_boot )
return NULL;
offset = phys & (PAGE_SIZE - 1);
base = FIXMAP_ADDR(FIXMAP_ACPI_BEGIN) + offset;
/* Check the fixmap is big enough to map the region */
if ( (FIXMAP_ADDR(FIXMAP_ACPI_END) + PAGE_SIZE - base) < size )
return NULL;
/* With the fixmap, we can only map one region at the time */
if ( fixmap_inuse )
return NULL;
fixmap_inuse = true;
size += offset;
mfn = maddr_to_mfn(phys);
idx = FIXMAP_ACPI_BEGIN;
do {
set_fixmap(idx, mfn, PAGE_HYPERVISOR);
size -= min(size, (unsigned long)PAGE_SIZE);
mfn = mfn_add(mfn, 1);
idx++;
} while ( size > 0 );
return (char *)base;
}
bool __acpi_unmap_table(const void *ptr, unsigned long size)
{
vaddr_t vaddr = (vaddr_t)ptr;
unsigned int idx;
/* We are only handling fixmap address in the arch code */
if ( (vaddr < FIXMAP_ADDR(FIXMAP_ACPI_BEGIN)) ||
(vaddr >= (FIXMAP_ADDR(FIXMAP_ACPI_END) + PAGE_SIZE)) )
return false;
/*
* __acpi_map_table() will always return a pointer in the first page
* for the ACPI fixmap region. The caller is expected to free with
* the same address.
*/
ASSERT((vaddr & PAGE_MASK) == FIXMAP_ADDR(FIXMAP_ACPI_BEGIN));
/* The region allocated fit in the ACPI fixmap region. */
ASSERT(size < (FIXMAP_ADDR(FIXMAP_ACPI_END) + PAGE_SIZE - vaddr));
ASSERT(fixmap_inuse);
fixmap_inuse = false;
size += vaddr - FIXMAP_ADDR(FIXMAP_ACPI_BEGIN);
idx = FIXMAP_ACPI_BEGIN;
do
{
clear_fixmap(idx);
size -= min(size, (unsigned long)PAGE_SIZE);
idx++;
} while ( size > 0 );
return true;
}
/* True to indicate PSCI 0.2+ is implemented */
bool __init acpi_psci_present(void)
{
return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
}
/* True to indicate HVC is present instead of SMC as the PSCI conduit */
bool __init acpi_psci_hvc_present(void)
{
return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
}
paddr_t __init acpi_get_table_offset(struct membank tbl_add[],
EFI_MEM_RES index)
{
int i;
paddr_t offset = 0;
for ( i = 0; i < index; i++ )
{
/* Aligned with 64bit (8 bytes) */
offset += ROUNDUP(tbl_add[i].size, 8);
}
return offset;
}
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