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annotate level2/modules/kernel/fgblkmp.asm @ 3195:6eb2edad80d8

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L2: Introduce symbol KrnBlk to define kernel block number This is the block number that the kernel is loaded into. This is platform-specific, a function of the behaviour of the platform MMU/DAT. CRCs are unaffected by this change.
author Neal Crook <foofoobedoo@gmail.com>
date Thu, 01 Jun 2017 22:13:49 +0100
parents 039ddb7c8ad7
children
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1 **************************************************
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2 * System Call: F$GBlkMp
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3 *
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4 * Function:
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5 *
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6 * Input: X = 1024 byte buffer pointer
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7 *
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8 * Output: D = Number of bytes per block
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9 * Y = Size of system's memory block map
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10 *
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11 *
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12 * Error: CC = C bit set; B = error code
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13 *
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14 FGBlkMp ldd #DAT.BlSz # bytes per MMU block (8k)
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15 std R$D,u Put into caller's D register
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16 ldd <D.BlkMap+2 Get end of system block map ptr
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17 subd <D.BlkMap Subtract start of system block map ptr
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18 std R$Y,u Store size of system block map in caller's Y reg.
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19 tfr d,y
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20 lda <D.SysTsk Get system task #
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21 ldx <D.Proc Get caller's task #
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22 ldb P$Task,x get task # of caller
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23 ldx <D.BlkMap Get start ptr of system block map
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24 L0978 ldu R$X,u Get addr to put it that caller requested
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25 os9 F$Move Move it into caller's space
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parents: 1345
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26 rts