mirror of
https://github.com/elliotnunn/powermac-rom.git
synced 2024-06-06 17:29:32 +00:00
7bee860e40
CPU plugins are code fragment resources that allow the NanoKernel to perform CPU-specific functions, such as starting or stopping a processor core or getting core temperature. They live in the Apple CPU Plugins file. The Power Manager selects a plugin at boot (or doesn't), prepares and holds it in memory, and registers it with the NanoKernel using MPRegisterCpuPlugin(). The NanoKernel can then call any of the plugin's entry points synchronously using its SIGP() function, which is also exposed via the MPCpuPlugin() call. The plugin return path is tricky, but involved the ReturnFromInterrupt trap instruction in the emulator ROM code. The CPU plugin calling convention is described in the SIGP comments. CPU plugins operate in the blue address space, but with interrupts disabled and supervisor mode on. This code was reversed to get the Mac mini working. It is not clear how the Power Manager determines CPU temperature when there are no CPU registers to do this.
68 lines
1.6 KiB
ArmAsm
68 lines
1.6 KiB
ArmAsm
;_______________________________________________________________________
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; Equates for the whole NanoKernel
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;_______________________________________________________________________
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kNanoKernelVersion equ $0228
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; PowerPC Machine Status Register (MSR) bits
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; (borrowing the _bitEqu macro from NKInfoRecordsPriv.s)
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_bitEqu MSR_POW, 13
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_bitEqu MSR_ILE, 15
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_bitEqu MSR_EE, 16
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_bitEqu MSR_PR, 17
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_bitEqu MSR_FP, 18
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_bitEqu MSR_ME, 19
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_bitEqu MSR_FE0, 20
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_bitEqu MSR_SE, 21
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_bitEqu MSR_BE, 22
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_bitEqu MSR_FE1, 23
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_bitEqu MSR_IP, 25
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_bitEqu MSR_IR, 26
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_bitEqu MSR_DR, 27
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_bitEqu MSR_RI, 30
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_bitEqu MSR_LE, 31
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; Special Purpose Registers (SPRs) not understood by MPW
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l2cr equ 1017
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; Alignment for NanoKernel interrupt routines (mostly Interrupts.s)
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kIntAlign equ 5
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; Junk
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; IRP is 10 pages below KDP (measured start to start)
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IRPOffset equ (-10) * 4096
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kKDPfromIRP equ 10 * 4096
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; Branch instruction BO fields
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; (disregarding static prediction :)
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BO_IF equ 12
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BO_IF_NOT equ 4
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Z equ 0x80000000
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; SIGP (SIGnal Plugin) selectors used by the kernel:
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kStartProcessor equ 1 ; r4 = target CPU idx, r5 = cpu's entry point, r6 = entry point's r3 (CPU struct ptr)
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kStopProcessor equ 3 ; r4 = target CPU idx
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kResetProcessor equ 4 ; r4 = target CPU idx
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kAlert equ 5 ; r4 = target CPU idx? ; my name, has something to do with timers
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kSIGP6 equ 6 ; r4 = target CPU idx?
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kSIGP7 equ 7 ; r4 = target CPU idx?
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kSynchClock equ 8 ; r4 = target CPU idx,
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kSIGP9 equ 9 ; no args?
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kSIGPGetTemp equ 12 ; r4 = selector (ignored on Core99), r5 = cpu ID ; my name
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kSIGP17 equ 17 ; r4 = target CPU idx?
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