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Bare metal: add degenerate MBR partition entry, to ease testing

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tkchia 2022-09-12 05:46:38 +00:00
parent ae3f8612eb
commit 7b053a8647
1 changed files with 12 additions and 12 deletions
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24
ape/ape.S
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@ -485,19 +485,19 @@ ape.mbrpad:
ape_disk:
.stub ape.diskid,quad
.org 0x1be,0x00
.macro .partn x
.stub ape.part\x\().status,byte # 0=absent / 0x80=present
.stub ape.part\x\().first.head,byte # in low 6 bits
.stub ape.part\x\().first.cylinder,byte
.stub ape.part\x\().first.sector,byte
.stub ape.part\x\().filesystem,byte
.stub ape.part\x\().last.head,byte
.stub ape.part\x\().last.cylinder,byte
.stub ape.part\x\().last.sector,byte
.stub ape.part\x\().lba,long # c₀*Cₙ + h₀*Hₙ + s₀*Sₙ
.stub ape.part\x\().sector.count,long # sectors are 512 bytes
.macro .partn x:req sta h0 s0 c0 fs h9 s9 c9 lba0 nsec
.stub ape.part\x\().status,byte,\sta # 0=non-boot / 0x80=active
.stub ape.part\x\().first.head,byte,\h0
.stub ape.part\x\().first.sector,byte,\s0 # in low 6 bits
.stub ape.part\x\().first.cylinder,byte,\c0
.stub ape.part\x\().filesystem,byte,\fs
.stub ape.part\x\().last.head,byte,\h9
.stub ape.part\x\().last.sector,byte,\s9
.stub ape.part\x\().last.cylinder,byte,\c9
.stub ape.part\x\().lba,long,\lba0 # c₀*Cₙ + h₀*Hₙ + s₀*Sₙ
.stub ape.part\x\().sector.count,long,\nsec # sectors are 512 bytes
.endm
.partn 1
.partn 1,0x80,0,1,0,0x7f,0xff,0xff,0xff,0,0xffffffff
.partn 2
.partn 3
.partn 4