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| author | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2020-10-12 11:57:48 +0200 |
|---|---|---|
| committer | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2020-10-17 11:13:15 +0200 |
| commit | 2dc29222a6f7c87300c1a7e1982e11422d34595e (patch) | |
| tree | 2c1faf1dc625d2d038a828b5b081fd3e9838f68f /target/mips/cp0_timer.c | |
| parent | 88a844545e0fb1fa95a55888fb31024fcfc9720b (diff) | |
| download | qemu-2dc29222a6f7c87300c1a7e1982e11422d34595e.zip qemu-2dc29222a6f7c87300c1a7e1982e11422d34595e.tar.gz qemu-2dc29222a6f7c87300c1a7e1982e11422d34595e.tar.bz2 | |
target/mips: Move cpu_mips_get_random() with CP0 helpers
The get_random() helper uses the CP0_Wired register, which is
unrelated to the CP0_Count register used as timer.
Commit e16fe40c872 ("Move the MIPS CPU timer in a separate file")
incorrectly moved this get_random() helper with timer specific
code. Move it back to generic CP0 helpers.
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Message-Id: <20201012095804.3335117-6-f4bug@amsat.org>
Diffstat (limited to 'target/mips/cp0_timer.c')
| -rw-r--r-- | target/mips/cp0_timer.c | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/target/mips/cp0_timer.c b/target/mips/cp0_timer.c index bd7efb1..9c38e9d 100644 --- a/target/mips/cp0_timer.c +++ b/target/mips/cp0_timer.c @@ -29,31 +29,6 @@ #define TIMER_PERIOD 10 /* 10 ns period for 100 Mhz frequency */ -/* XXX: do not use a global */ -uint32_t cpu_mips_get_random(CPUMIPSState *env) -{ - static uint32_t seed = 1; - static uint32_t prev_idx = 0; - uint32_t idx; - uint32_t nb_rand_tlb = env->tlb->nb_tlb - env->CP0_Wired; - - if (nb_rand_tlb == 1) { - return env->tlb->nb_tlb - 1; - } - - /* Don't return same value twice, so get another value */ - do { - /* - * Use a simple algorithm of Linear Congruential Generator - * from ISO/IEC 9899 standard. - */ - seed = 1103515245 * seed + 12345; - idx = (seed >> 16) % nb_rand_tlb + env->CP0_Wired; - } while (idx == prev_idx); - prev_idx = idx; - return idx; -} - /* MIPS R4K timer */ static void cpu_mips_timer_update(CPUMIPSState *env) { |