* [Qemu-devel] [Qemu devel] Question: Qemu support up to 4GB physical memory?
@ 2009-04-26 12:32 wuxi
2009-04-26 12:41 ` [Qemu-devel] " 吴曦
0 siblings, 1 reply; 3+ messages in thread
From: wuxi @ 2009-04-26 12:32 UTC (permalink / raw)
To: Qemu Development List
Hi, all:
I am hacking QEMU (for a course project) based on the 0.10.1 version on
x86-64 architecture. My question arises when I was checking the code of
PageDesc in QEMU. I found it uses a two level mapping (l1_map), and it
seems that QEMU can support physical memory up to 210 * 210 * (4KB) =
4GB.
the related code is:
(L1_BITS = 10, L2_BITS=10, TARGET_PAGE_BITS=12)
#define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS)
#define L1_SIZE (1 << L1_BITS)
#define L2_SIZE (1 << L2_BITS)
static PageDesc *l1_map[L1_SIZE];
p = qemu_mallocz(sizeof(PageDesc) * L2_SIZE); (for each l1_map entry)
Is this true for QEMU x86-64 emulation? or I made some silly mistakes...
Thanks !
yours sincerely
Andrew
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Qemu-devel] Question: Qemu support up to 4GB physical memory?
2009-04-26 12:32 [Qemu-devel] [Qemu devel] Question: Qemu support up to 4GB physical memory? wuxi
@ 2009-04-26 12:41 ` 吴曦
0 siblings, 0 replies; 3+ messages in thread
From: 吴曦 @ 2009-04-26 12:41 UTC (permalink / raw)
To: qemu-devel
Hi, all:
I am hacking QEMU (for a course project) based on the 0.10.1 version
on x86-64 architecture. My question arises when I was checking the
code of PageDesc in QEMU. I found it uses a two level mapping
(l1_map), and it seems that QEMU can support physical memory up to
210 * 210 * (4KB) = 4GB.
the related code is:
(L1_BITS = 10, L2_BITS=10, TARGET_PAGE_BITS=12)
#define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS)
#define L1_SIZE (1 << L1_BITS)
#define L2_SIZE (1 << L2_BITS)
static PageDesc *l1_map[L1_SIZE];
p = qemu_mallocz(sizeof(PageDesc) * L2_SIZE); (for each l1_map entry)
Is this true for QEMU x86-64 emulation? or I made some silly mistakes...
Thanks !
yours sincerely
Andrew
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Qemu-devel] Question: Qemu support up to 4GB physical memory?
@ 2009-04-26 12:48 wuxi
0 siblings, 0 replies; 3+ messages in thread
From: wuxi @ 2009-04-26 12:48 UTC (permalink / raw)
To: Qemu Development List
Hi, all:
I am hacking QEMU (for a course project) based on the 0.10.1 version on
x86-64 architecture. My question arises when I was checking the code of
"PageDesc" in QEMU. I found it uses a two level mapping (l1_map), and it
seems that QEMU can support physical memory up to 210 * 210 * (4KB) =
4GB.
the related code is:
(L1_BITS = 10, L2_BITS=10, TARGET_PAGE_BITS=12)
#define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS)
#define L1_SIZE (1 << L1_BITS)
#define L2_SIZE (1 << L2_BITS)
static PageDesc *l1_map[L1_SIZE];
p = qemu_mallocz(sizeof(PageDesc) * L2_SIZE); (for each l1_map entry)
Is this true for QEMU x86-64 emulation? or I made some silly mistakes...
Thanks !
yours sincerely
Andrew
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2009-04-26 13:38 UTC | newest]
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2009-04-26 12:32 [Qemu-devel] [Qemu devel] Question: Qemu support up to 4GB physical memory? wuxi
2009-04-26 12:41 ` [Qemu-devel] " 吴曦
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2009-04-26 12:48 wuxi
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