1 =======
2 Porting
3 =======
4
5 Taken from list archive at http://lists.arm.li
6
7 Initial definitions
8 -------------------
9
10 The following symbol definitions rely on you k
11 __virt_to_phys() does for your machine. This
12 virtual address to a physical address. Normal
13
14 phys = virt - PAGE_OFFSET + PH
15
16
17 Decompressor Symbols
18 --------------------
19
20 ZTEXTADDR
21 Start address of decompressor. There'
22 virtual or physical addresses here, si
23 the time when you call the decompresso
24 the kernel at this address to start it
25 to be located in RAM, it can be in fla
26 read-write addressable medium.
27
28 ZBSSADDR
29 Start address of zero-initialised work
30 This must be pointing at RAM. The dec
31 this for you. Again, the MMU will be
32
33 ZRELADDR
34 This is the address where the decompre
35 and eventually executed. The followin
36
37 __virt_to_phys(TEXTADDR) == ZR
38
39 The initial part of the kernel is care
40 independent.
41
42 INITRD_PHYS
43 Physical address to place the initial
44 you are using the bootpImage stuff (wh
45 struct param_struct).
46
47 INITRD_VIRT
48 Virtual address of the initial RAM dis
49 must be valid:
50
51 __virt_to_phys(INITRD_VIRT) ==
52
53 PARAMS_PHYS
54 Physical address of the struct param_s
55 kernel various parameters about its ex
56
57
58 Kernel Symbols
59 --------------
60
61 PHYS_OFFSET
62 Physical start address of the first ba
63
64 PAGE_OFFSET
65 Virtual start address of the first ban
66 boot phase, virtual address PAGE_OFFSE
67 address PHYS_OFFSET, along with any ot
68 This should be the same value as TASK_
69
70 TASK_SIZE
71 The maximum size of a user process in
72 always starts at zero, this is the max
73 process can access+1. The user space
74 address.
75
76 Any virtual address below TASK_SIZE is
77 area, and therefore managed dynamicall
78 basis by the kernel. I'll call this t
79
80 Anything above TASK_SIZE is common to
81 this the kernel segment.
82
83 (In other words, you can't put IO mapp
84 hence PAGE_OFFSET).
85
86 TEXTADDR
87 Virtual start address of kernel, norma
88 This is where the kernel image ends up
89 it must be located at 32768 bytes into
90 kernels placed a restriction of 256MB
91
92 DATAADDR
93 Virtual address for the kernel data se
94 when using the decompressor.
95
96 VMALLOC_START / VMALLOC_END
97 Virtual addresses bounding the vmalloc
98 any static mappings in this area; vmal
99 The addresses must also be in the kern
100 Normally, the vmalloc() area starts VM
101 last virtual RAM address (found using
102
103 VMALLOC_OFFSET
104 Offset normally incorporated into VMAL
105 between virtual RAM and the vmalloc ar
106 out of bounds memory accesses (eg, som
107 of the mapped memory map) to be caught
108
109 Architecture Specific Macros
110 ----------------------------
111
112 BOOT_MEM(pram,pio,vio)
113 `pram` specifies the physical start ad
114 be present, and should be the same as
115
116 `pio` is the physical address of an 8M
117 use with the debugging macros in arch/
118
119 `vio` is the virtual address of the 8M
120
121 It is expected that the debugging regi
122 by the architecture specific code late
123 MAPIO function).
124
125 BOOT_PARAMS
126 Same as, and see PARAMS_PHYS.
127
128 FIXUP(func)
129 Machine specific fixups, run before me
130 initialised.
131
132 MAPIO(func)
133 Machine specific function to map IO ar
134 region above).
135
136 INITIRQ(func)
137 Machine specific function to initialis
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