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https://github.com/brain-hackers/linux-brain.git
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e907a0d09b
[ Upstream commit aefd9461d34a1b0a2acad0750c43216c1c27b9d4 ] For the memory size ( > 512MB, < 1GB), the MSA setting is: - SSEG0: PHY_START , PHY_START + 512MB - SSEG1: PHY_START + 512MB, PHY_START + 1GB But the real memory is no more than 1GB, there is a gap between the end size of memory and border of 1GB. CPU could speculatively execute to that gap and if the gap of the bus couldn't respond to the CPU request, then the crash will happen. Now make the setting with: - SSEG0: PHY_START , PHY_START + 512MB (no change) - SSEG1: Disabled (We use highmem to use the memory of 512MB~1GB) We also deprecated zhole_szie[] settings, it's only used by arm style CPUs. All memory gap should use Reserved setting of dts in csky system. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
37 lines
587 B
ArmAsm
37 lines
587 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/page.h>
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#include <abi/entry.h>
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__HEAD
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ENTRY(_start)
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SETUP_MMU
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/* set stack point */
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lrw r6, init_thread_union + THREAD_SIZE
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mov sp, r6
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jmpi csky_start
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END(_start)
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#ifdef CONFIG_SMP
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.align 10
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ENTRY(_start_smp_secondary)
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SETUP_MMU
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/* copy msa1 from CPU0 */
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lrw r6, secondary_msa1
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ld.w r6, (r6, 0)
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mtcr r6, cr<31, 15>
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/* set stack point */
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lrw r6, secondary_stack
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ld.w r6, (r6, 0)
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mov sp, r6
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jmpi csky_start_secondary
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END(_start_smp_secondary)
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#endif
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