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authorAvi Kivity <avi@redhat.com>2011-08-15 17:17:38 +0300
committerAnthony Liguori <aliguori@us.ibm.com>2011-08-22 10:47:49 -0500
commitae0a54664c76f1d2a2a7a268266d47b4e8c12a4c (patch)
treeb4a664a81fe572ce96640fdc74b0ec2ca172ee2a /memory.c
parentbe20f9e902ca47ea84e1b1c1e89b0a55d59b4c11 (diff)
440fx: fix PAM, PCI holes
The current implementation of PAM and the PCI holes is broken in several ways: - PCI BARs are not restricted to the PCI hole (a BAR may hide memory) - PCI devices do not respect PAM (if a PCI device maps a region while PAM maps the region to RAM, the request will be honored) This patch fixes things by introducing a pci address space, and using memory region aliases to represent PAM regions, SMRAM, and PCI holes. The memory hierarchy looks something like system_memory | +--- low memory alias (0-0xe0000000) | | | +-- ram@0 | +--- high memory alias (0x100000000-EOM) | | | +-- ram@0xe0000000 | +--- pci hole alias (end of low memory-0x100000000) | | | +-- pci@end-of-low-memory | | +--- pam[n] (0xc0000-0xc3fff etc) (when set to pci, priority 1) | | | +-- pci@0xc4000 etc | +--- smram (0xa0000-0xbffff) (when set to pci/vga, priority 1) | +-- pci@0xa0000 etc ram (simple ram region) pci | +--- BARn | +--- VGA 0xa0000-0xbffff | +--- ROMs Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'memory.c')
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