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| author | Helge Deller <deller@gmx.de> | 2023-09-29 19:44:01 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2023-09-29 19:44:01 +0200 |
| commit | 483a6cdf942d3181cdaec72f1c4a5c2aa632984c (patch) | |
| tree | 2bb69cc2ee38d57e2b5d2ebd2f099f9670dfd830 | |
| parent | 5f40ad4df2a18bd8a4ec60ae11b26075d735d033 (diff) | |
| download | seabios-hppa-483a6cdf942d3181cdaec72f1c4a5c2aa632984c.zip seabios-hppa-483a6cdf942d3181cdaec72f1c4a5c2aa632984c.tar.gz seabios-hppa-483a6cdf942d3181cdaec72f1c4a5c2aa632984c.tar.bz2 | |
Block TLB only for 32-bit CPUs
| -rw-r--r-- | src/parisc/parisc.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/parisc/parisc.c b/src/parisc/parisc.c index 45fb965..1fbd8f2 100644 --- a/src/parisc/parisc.c +++ b/src/parisc/parisc.c @@ -1346,6 +1346,10 @@ static int pdc_block_tlb(unsigned int *arg) { int ret; + /* Block TLB is only supported on 32-bit CPUs */ + if (cpu_bit_width != 32) + return PDC_BAD_PROC; + asm( "ldw (7-0)*%2(%1),%%r26 ! ldw (7-1)*%2(%1),%%r25 ! ldw (7-2)*%2(%1),%%r24 ! ldw (7-3)*%2(%1),%%r23\n" "ldw (7-4)*%2(%1),%%r22 ! ldw (7-5)*%2(%1),%%r21 ! ldw (7-6)*%2(%1),%%r20 ! ldw (7-7)*%2(%1),%%r19\n" @@ -2259,9 +2263,12 @@ void __VISIBLE start_parisc_firmware(void) char bootdrive = (char)cmdline; // c = hdd, d = CD/DVD show_boot_menu = (linux_kernel_entry == 1); - // detect if we emulate a 32- or 64-bit CPU - asm("mtctl %0,%%cr11 ! mfctl %%cr11,%0\n" : "=&r" (i) : "0" (-1)); - cpu_bit_width = (i == 63) ? 64 : 32; + // detect if we emulate a 32- or 64-bit CPU. + // set all bits in cr11, read back, and if the return + // value is 63 this is a 64-bit capable CPU. + // A 32-bit only CPU returns 31. + mtctl(-1UL, 11); + cpu_bit_width = (mfctl(11) == 63) ? 64 : 32; if (smp_cpus > HPPA_MAX_CPUS) smp_cpus = HPPA_MAX_CPUS; |