| /* |
| * Hypercall helpers |
| * |
| * broken_sc1 probing/patching inspired by SLOF, see |
| * SLOF:lib/libhvcall/brokensc1.c |
| * |
| * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com> |
| * |
| * This work is licensed under the terms of the GNU LGPL, version 2. |
| */ |
| #include <asm/hcall.h> |
| |
| int hcall_have_broken_sc1(void) |
| { |
| register unsigned long r3 asm("r3") = H_SET_DABR; |
| register unsigned long r4 asm("r4") = 0; |
| |
| asm volatile("sc 1" |
| : "=r" (r3) |
| : "r" (r3), "r" (r4) |
| : "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"); |
| |
| return r3 == (unsigned long)H_PRIVILEGE; |
| } |
| |
| void putchar(int c) |
| { |
| unsigned long vty = 0; /* 0 == default */ |
| unsigned long nr_chars = 1; |
| unsigned long chars = (unsigned long)c << 56; |
| |
| hcall(H_PUT_TERM_CHAR, vty, nr_chars, chars); |
| } |
