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/*
* HVM e820 support.
*
* Leendert van Doorn, leendert@watson.ibm.com
* Copyright (c) 2005, International Business Machines Corporation.
* Copyright (c) 2006, Keir Fraser, XenSource Inc.
* Copyright (c) 2011, Citrix Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*/
#include "config.h"
#include "util.h"
void dump_e820_table(struct e820entry *e820, unsigned int nr)
{
uint64_t last_end = 0, start, end;
int i;
printf("E820 table:\n");
for ( i = 0; i < nr; i++ )
{
start = e820[i].addr;
end = e820[i].addr + e820[i].size;
if ( start < last_end )
printf(" OVERLAP!!\n");
else if ( start > last_end )
printf(" HOLE: %08x:%08x - %08x:%08x\n",
(uint32_t)(last_end >> 32), (uint32_t)last_end,
(uint32_t)(start >> 32), (uint32_t)start);
printf(" [%02d]: %08x:%08x - %08x:%08x: ", i,
(uint32_t)(start >> 32), (uint32_t)start,
(uint32_t)(end >> 32), (uint32_t)end);
switch ( e820[i].type )
{
case E820_RAM:
printf("RAM\n");
break;
case E820_RESERVED:
printf("RESERVED\n");
break;
case E820_ACPI:
printf("ACPI\n");
break;
case E820_NVS:
printf("NVS\n");
break;
default:
printf("UNKNOWN (%08x)\n", e820[i].type);
break;
}
last_end = end;
}
}
/* Create an E820 table based on memory parameters provided in hvm_info. */
int build_e820_table(struct e820entry *e820,
unsigned int lowmem_reserved_base,
unsigned int bios_image_base)
{
unsigned int nr = 0;
if ( !lowmem_reserved_base )
lowmem_reserved_base = 0xA0000;
/* Lowmem must be at least 512K to keep Windows happy) */
ASSERT ( lowmem_reserved_base > 512<<10 );
ASSERT ( bios_image_base < 0x100000 );
/*
* 0x0-lowmem_reserved_base: Ordinary RAM.
*/
e820[nr].addr = 0x00000;
e820[nr].size = lowmem_reserved_base;
e820[nr].type = E820_RAM;
nr++;
/* lowmem_reserved_base-0xA0000: reserved by BIOS implementation. */
if ( lowmem_reserved_base < 0xA0000 )
{
/* Reserved for internal use. */
e820[nr].addr = lowmem_reserved_base;
e820[nr].size = 0xA0000-lowmem_reserved_base;
e820[nr].type = E820_RESERVED;
nr++;
}
/*
* Following regions are standard regions of the PC memory map.
* They are not covered by e820 regions. OSes will not use as RAM.
* 0xA0000-0xC0000: VGA memory-mapped I/O. Not covered by E820.
* 0xC0000-0xE0000: 16-bit devices, expansion ROMs (inc. vgabios).
* TODO: free pages which turn out to be unused.
*/
/*
* BIOS region.
*/
e820[nr].addr = bios_image_base;
e820[nr].size = 0x100000-bios_image_base;
e820[nr].type = E820_RESERVED;
nr++;
/* Low RAM goes here. Reserve space for special pages. */
BUG_ON((hvm_info->low_mem_pgend << PAGE_SHIFT) < (2u << 20));
e820[nr].addr = 0x100000;
e820[nr].size = (hvm_info->low_mem_pgend << PAGE_SHIFT) - e820[nr].addr;
e820[nr].type = E820_RAM;
nr++;
/*
* Explicitly reserve space for special pages.
* This space starts at RESERVED_MEMBASE an extends to cover various
* fixed hardware mappings (e.g., LAPIC, IOAPIC, default SVGA framebuffer).
*
* If igd_opregion_pgbase we need to split the RESERVED region in two.
*/
if ( igd_opregion_pgbase )
{
uint32_t igd_opregion_base = igd_opregion_pgbase << PAGE_SHIFT;
e820[nr].addr = RESERVED_MEMBASE;
e820[nr].size = (uint32_t) igd_opregion_base - RESERVED_MEMBASE;
e820[nr].type = E820_RESERVED;
nr++;
e820[nr].addr = igd_opregion_base;
e820[nr].size = 2 * PAGE_SIZE;
e820[nr].type = E820_NVS;
nr++;
e820[nr].addr = igd_opregion_base + 2 * PAGE_SIZE;
e820[nr].size = (uint32_t)-e820[nr].addr;
e820[nr].type = E820_RESERVED;
nr++;
}
else
{
e820[nr].addr = RESERVED_MEMBASE;
e820[nr].size = (uint32_t)-e820[nr].addr;
e820[nr].type = E820_RESERVED;
nr++;
}
if ( hvm_info->high_mem_pgend )
{
e820[nr].addr = ((uint64_t)1 << 32);
e820[nr].size =
((uint64_t)hvm_info->high_mem_pgend << PAGE_SHIFT) - e820[nr].addr;
e820[nr].type = E820_RAM;
nr++;
}
return nr;
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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