2023-08-30 17:31:07 +02:00
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/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/page.h>
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#include <asm/setup.h>
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#define MMU_BASE 8 /* MMU flags base in cpu_mmu_flags */
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.text
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ENTRY(relocate_new_kernel)
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movel %sp@(4),%a0 /* a0 = ptr */
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movel %sp@(8),%a1 /* a1 = start */
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movel %sp@(12),%d1 /* d1 = cpu_mmu_flags */
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movew #PAGE_MASK,%d2 /* d2 = PAGE_MASK */
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/* Disable MMU */
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btst #MMU_BASE + MMUB_68851,%d1
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jeq 3f
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1: /* 68851 or 68030 */
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lea %pc@(.Lcopy),%a4
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2: addl #0x00000000,%a4 /* virt_to_phys() */
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2023-10-24 12:59:35 +02:00
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.section .m68k_fixup,"aw"
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2023-08-30 17:31:07 +02:00
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.long M68K_FIXUP_MEMOFFSET, 2b+2
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.previous
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.chip 68030
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pmove %tc,%d0 /* Disable MMU */
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bclr #7,%d0
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pmove %d0,%tc
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jmp %a4@ /* Jump to physical .Lcopy */
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.chip 68k
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3:
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btst #MMU_BASE + MMUB_68030,%d1
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jne 1b
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btst #MMU_BASE + MMUB_68040,%d1
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jeq 6f
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4: /* 68040 or 68060 */
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lea %pc@(.Lcont040),%a4
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5: addl #0x00000000,%a4 /* virt_to_phys() */
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2023-10-24 12:59:35 +02:00
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.section .m68k_fixup,"aw"
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2023-08-30 17:31:07 +02:00
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.long M68K_FIXUP_MEMOFFSET, 5b+2
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.previous
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movel %a4,%d0
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andl #0xff000000,%d0
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orw #0xe020,%d0 /* Map 16 MiB, enable, cacheable */
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.chip 68040
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movec %d0,%itt0
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movec %d0,%dtt0
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.chip 68k
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jmp %a4@ /* Jump to physical .Lcont040 */
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.Lcont040:
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moveq #0,%d0
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.chip 68040
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movec %d0,%tc /* Disable MMU */
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movec %d0,%itt0
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movec %d0,%itt1
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movec %d0,%dtt0
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movec %d0,%dtt1
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.chip 68k
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jra .Lcopy
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6:
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btst #MMU_BASE + MMUB_68060,%d1
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jne 4b
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.Lcopy:
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movel %a0@+,%d0 /* d0 = entry = *ptr */
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jeq .Lflush
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btst #2,%d0 /* entry & IND_DONE? */
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jne .Lflush
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btst #1,%d0 /* entry & IND_INDIRECTION? */
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jeq 1f
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andw %d2,%d0
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movel %d0,%a0 /* ptr = entry & PAGE_MASK */
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jra .Lcopy
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1:
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btst #0,%d0 /* entry & IND_DESTINATION? */
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jeq 2f
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andw %d2,%d0
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movel %d0,%a2 /* a2 = dst = entry & PAGE_MASK */
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jra .Lcopy
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2:
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btst #3,%d0 /* entry & IND_SOURCE? */
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jeq .Lcopy
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andw %d2,%d0
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movel %d0,%a3 /* a3 = src = entry & PAGE_MASK */
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movew #PAGE_SIZE/32 - 1,%d0 /* d0 = PAGE_SIZE/32 - 1 */
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3:
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movel %a3@+,%a2@+ /* *dst++ = *src++ */
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movel %a3@+,%a2@+ /* *dst++ = *src++ */
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movel %a3@+,%a2@+ /* *dst++ = *src++ */
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movel %a3@+,%a2@+ /* *dst++ = *src++ */
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movel %a3@+,%a2@+ /* *dst++ = *src++ */
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movel %a3@+,%a2@+ /* *dst++ = *src++ */
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movel %a3@+,%a2@+ /* *dst++ = *src++ */
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movel %a3@+,%a2@+ /* *dst++ = *src++ */
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dbf %d0, 3b
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jra .Lcopy
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.Lflush:
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/* Flush all caches */
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btst #CPUB_68020,%d1
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jeq 2f
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1: /* 68020 or 68030 */
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.chip 68030
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movec %cacr,%d0
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orw #0x808,%d0
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movec %d0,%cacr
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.chip 68k
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jra .Lreincarnate
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2:
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btst #CPUB_68030,%d1
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jne 1b
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btst #CPUB_68040,%d1
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jeq 4f
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3: /* 68040 or 68060 */
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.chip 68040
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nop
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cpusha %bc
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nop
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cinva %bc
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nop
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.chip 68k
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jra .Lreincarnate
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4:
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btst #CPUB_68060,%d1
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jne 3b
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.Lreincarnate:
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jmp %a1@
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relocate_new_kernel_end:
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ENTRY(relocate_new_kernel_size)
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.long relocate_new_kernel_end - relocate_new_kernel
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