1 | /* Test the implementation of __ppc_set_ppr_* functions. |
2 | Copyright (C) 2017-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <inttypes.h> |
20 | #include <stdio.h> |
21 | #include <stdint.h> |
22 | #include <sys/auxv.h> |
23 | |
24 | #include <sys/platform/ppc.h> |
25 | |
26 | #include <support/test-driver.h> |
27 | |
28 | #ifdef __powerpc64__ |
29 | typedef uint64_t ppr_t; |
30 | # define MFPPR "mfppr" |
31 | /* The thread priority value is obtained from bits 11:13. */ |
32 | # define EXTRACT_THREAD_PRIORITY(x) ((x >> 50) & 7) |
33 | #else |
34 | typedef uint32_t ppr_t; |
35 | # define MFPPR "mfppr32" |
36 | /* For 32-bit, the upper 32 bits of the Program Priority Register (PPR) |
37 | are used, so the thread priority value is obtained from bits 43:46. */ |
38 | # define (x) ((x >> 18) & 7) |
39 | #endif /* !__powerpc64__ */ |
40 | |
41 | /* Read the thread priority value set in the PPR. */ |
42 | static __inline__ ppr_t |
43 | get_thread_priority (void) |
44 | { |
45 | /* Read the PPR. */ |
46 | ppr_t ppr; |
47 | asm volatile (".machine push; .machine power7; " MFPPR" %0; .machine pop" |
48 | : "=r" (ppr)); |
49 | /* Return the thread priority value. */ |
50 | return EXTRACT_THREAD_PRIORITY (ppr); |
51 | } |
52 | |
53 | /* Check the thread priority bits of PPR are set as expected. */ |
54 | uint8_t |
55 | check_thread_priority (uint8_t expected) |
56 | { |
57 | ppr_t actual = get_thread_priority (); |
58 | |
59 | if (actual != expected) |
60 | { |
61 | printf (format: "FAIL: Expected %" PRIu8" got %" PRIuMAX".\n" , expected, |
62 | (uintmax_t) actual); |
63 | return 1; |
64 | } |
65 | printf (format: "PASS: Thread priority set to %" PRIu8" correctly.\n" , expected); |
66 | return 0; |
67 | } |
68 | |
69 | /* The Power ISA 2.06 allows the following thread priorities for any |
70 | problem state program: low (2), medium low (3), and medium (4). |
71 | Power ISA 2.07b added very low (1). |
72 | Check whether the values set by __ppc_set_ppr_* are correct. */ |
73 | static int |
74 | do_test (void) |
75 | { |
76 | /* Check for the minimum required Power ISA to run these tests. */ |
77 | if ((getauxval (AT_HWCAP) & PPC_FEATURE_ARCH_2_06) == 0) |
78 | { |
79 | printf (format: "Requires an environment that implements the Power ISA version" |
80 | " 2.06 or greater.\n" ); |
81 | return EXIT_UNSUPPORTED; |
82 | } |
83 | |
84 | uint8_t rc = 0; |
85 | |
86 | #ifdef _ARCH_PWR8 |
87 | __ppc_set_ppr_very_low (); |
88 | rc |= check_thread_priority (1); |
89 | #endif /* _ARCH_PWR8 */ |
90 | |
91 | __ppc_set_ppr_low (); |
92 | rc |= check_thread_priority (expected: 2); |
93 | |
94 | __ppc_set_ppr_med_low (); |
95 | rc |= check_thread_priority (expected: 3); |
96 | |
97 | __ppc_set_ppr_med (); |
98 | rc |= check_thread_priority (expected: 4); |
99 | |
100 | return rc; |
101 | } |
102 | |
103 | #include <support/test-driver.c> |
104 | |