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arm:document arm vm.h

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This commit is contained in:
Kees Jongenburger 2013-09-10 10:54:01 +02:00
parent a17691a98f
commit b08490a35b
1 changed files with 8 additions and 3 deletions
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11
include/arch/earm/include/vm.h
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@ -8,14 +8,14 @@ arm/vm.h
/*
* We are using the following setup
* the system is configured to have the TRE (Tex remap enable bit) set to 0
* The TEX[2:0] B and C bits are used to determins memoryt attributes.
* These bits together with the S Bit (Shareability Bit) determins the
* The TEX[2:0] B and C bits are used to determins memory attributes.
* These bits together with the S Bit (Shareability Bit) determines the
* memory attributes.
*
* The S bit is ignored when the other attribute define the memory as
* "device" or "strongly ordered"
*
* We are setting the tex[2] bit to one to en up with the following
* We are setting the tex[2] bit to one to end up with the following
* encoding
*
* 00 00 Non cacheable
@ -95,10 +95,15 @@ arm/vm.h
#define ARM_VM_PDE(v) ( (v) >> ARM_VM_DIR_ENT_SHIFT)
#define ARM_VM_PFA(e) ( (e) & ARM_VM_ADDR_MASK)
/* Second level small pages entry(Page Table Entry) points to 4K */
#define ARM_VM_PTE_SHIFT 12
#define ARM_VM_PTE_MASK (~((1 << ARM_VM_PTE_SHIFT) - 1))
/* First level entry(Page Directory Entry) to a second level small page PTE */
#define ARM_VM_PDE_SHIFT 10
#define ARM_VM_PDE_MASK (~((1 << ARM_VM_PDE_SHIFT) - 1))
/* First level entry(Page Directory Entry) to a 1MB section */
#define ARM_VM_SECTION_SHIFT 20
#define ARM_VM_SECTION_MASK (~((1 << ARM_VM_SECTION_SHIFT) - 1))