ppc: Add hack for working timebase #2257
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| #if 0 | ||
| #if 1 | ||
| // Broadway clock speed | ||
| #define TB_TIMER_CLOCK (243000000u/4000) |
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No, for my specific case I needed to use the Wii CPU's Timebase Frequency which is what this value represents
I can replace it with a value used by Qemu somewhere if desired, not sure which one since timebase frequency is different per machine in qemu due to it being hardware and software implementation dependent
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Oops sorry I thought it was from QEMU. How does QEMU ever set that?
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Qemu hardcodes the frequency per machine
E.g. old world PowerMac frequency is set here
https://github.com/qemu/qemu/blob/593aee5df98b4a862ff8841a57ea3dbf22131a5f/hw/ppc/mac_oldworld.c#L117
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Oh in that case, we have cpu_model to do this things (see uc_ctl_set_cpu_model). Does the Wii use a specific cpu model?
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Oh in that case, we have
cpu_modelto do this things (seeuc_ctl_set_cpu_model). Does the Wii use a specific cpu model?
On the code I've just been using PPC 750 who is the closest qemu has
I'll look into that, thanks!
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| #if 0 | ||
| #if 1 |
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You can safely remote all such #if 0 swtiches instead of changing it to #if 1.
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| OK(uc_emu_start(uc, code_start, code_start + sizeof(code_tblr) - 1, 0, 0)); | ||
| OK(uc_reg_read(uc, UC_PPC_REG_3, &r3_val)); | ||
| printf("TBLr: 0x%08x\n", BEINT32(r3_val)); |
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This should be a simple TEST_CHECK ?
| OK(uc_close(uc)); | ||
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| char code_tbur[] = "\x7c\x6d\x42\xa6"; // mfspr r3, TBUr | ||
| uc_common_setup(&uc, UC_ARCH_PPC, UC_MODE_32 | UC_MODE_BIG_ENDIAN, code_tbur, |
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Consider splitting these into 2 or 3 tests.
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A few stylish reviews. Thanks for your efforts! The CI failure has nothing to do with this PR. |
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This is currently has a hardcoded Timebase Frequency that should probably be made customizable at some point, but at least it works.
Closes #2256