diff options
Diffstat (limited to 'docs/memory.txt')
| -rw-r--r-- | docs/memory.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/docs/memory.txt b/docs/memory.txt index 3fc1683d88..5bbee8e85d 100644 --- a/docs/memory.txt +++ b/docs/memory.txt @@ -7,7 +7,7 @@ machine. It attempts to allow modelling of: - ordinary RAM - memory-mapped I/O (MMIO) - memory controllers that can dynamically reroute physical memory regions - to different destinations + to different destinations The memory model provides support for @@ -121,7 +121,7 @@ pci (0-2^32-1) ram: ram@0x00000000-0xffffffff -The is a (simplified) PC memory map. The 4GB RAM block is mapped into the +This is a (simplified) PC memory map. The 4GB RAM block is mapped into the system address space via two aliases: "lomem" is a 1:1 mapping of the first 3.5GB; "himem" maps the last 0.5GB at address 4GB. This leaves 0.5GB for the so-called PCI hole, that allows a 32-bit PCI bus to exist in a system with @@ -164,7 +164,7 @@ various constraints can be supplied to control how these callbacks are called: - .impl.min_access_size, .impl.max_access_size define the access sizes (in bytes) supported by the *implementation*; other access sizes will be emulated using the ones available. For example a 4-byte write will be - emulated using four 1-byte write, if .impl.max_access_size = 1. + emulated using four 1-byte writes, if .impl.max_access_size = 1. - .impl.valid specifies that the *implementation* only supports unaligned accesses; unaligned accesses will be emulated by two aligned accesses. - .old_portio and .old_mmio can be used to ease porting from code using |