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hw/sparc/leon3: check cpu_id in the tiny bootloader

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Now that SMP is possible, the asr17 must be checked in the little boot
code or the secondary CPU will reinitialize the Timer and the Uart.

Co-developed-by: Frederic Konrad <konrad.frederic@yahoo.fr>
Signed-off-by: Clément Chigot <chigot@adacore.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240131085047.18458-9-chigot@adacore.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Clément Chigot 2024-01-31 09:50:46 +01:00 committed by Philippe Mathieu-Daudé
parent d65aba8286
commit 56bd9678ef
1 changed files with 20 additions and 2 deletions
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22
hw/sparc/leon3.c
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@ -99,12 +99,26 @@ static uint32_t *gen_store_u32(uint32_t *code, hwaddr addr, uint32_t val)
/*
* When loading a kernel in RAM the machine is expected to be in a different
* state (eg: initialized by the bootloader). This little code reproduces
* this behavior.
* state (eg: initialized by the bootloader). This little code reproduces
* this behavior. Also this code can be executed by the secondary cpus as
* well since it looks at the %asr17 register before doing any
* initialization, it allows to use the same reset address for all the
* cpus.
*/
static void write_bootloader(void *ptr, hwaddr kernel_addr)
{
uint32_t *p = ptr;
uint32_t *sec_cpu_branch_p = NULL;
/* If we are running on a secondary CPU, jump directly to the kernel. */
stl_p(p++, 0x85444000); /* rd %asr17, %g2 */
stl_p(p++, 0x8530a01c); /* srl %g2, 0x1c, %g2 */
stl_p(p++, 0x80908000); /* tst %g2 */
/* Filled below. */
sec_cpu_branch_p = p;
stl_p(p++, 0x0BADC0DE); /* bne xxx */
stl_p(p++, 0x01000000); /* nop */
/* Initialize the UARTs */
/* *UART_CONTROL = UART_RECEIVE_ENABLE | UART_TRANSMIT_ENABLE; */
@ -118,6 +132,10 @@ static void write_bootloader(void *ptr, hwaddr kernel_addr)
/* *GPTIMER0_CONFIG = GPTIMER_ENABLE | GPTIMER_RESTART; */
p = gen_store_u32(p, 0x80000318, 3);
/* Now, the relative branch above can be computed. */
stl_p(sec_cpu_branch_p, 0x12800000
+ (p - sec_cpu_branch_p));
/* JUMP to the entry point */
stl_p(p++, 0x82100000); /* mov %g0, %g1 */
stl_p(p++, 0x03000000 + extract32(kernel_addr, 10, 22));